RCS Universal Profile (which is the one Apple will support) is a standard set of core features. People can and do build extra features on top of it, but the core features remain interoperable.
Whew, i think i look for a reason to log in on my new macbook

I knew I was going to have a fairly lengthy response to you and MR is terrible on phones. This M3 MBP is literally my favorite thing ever, but i will stop gushing and get on topic haha
***************************
And Much like Android itself, that opens up a can of worms when nobody is really following a set standard (SMS is a set standard. yes, dated but still set) that can be tweaked and modified to see fit thus running into issues of compatiability
I personally haven't had any reliability issues with RCS
Glad to hear that but we aren't talking about you. You are Pro-android and sing its praises daily on an iPhone centric site so i dont expect you to have any issues since you adovcate for RCS and Apple opening up IOS the way Android is.
i'd want to see actual reliability metrics to be convinced there's any meaningful issues in this regard, rather than just some anecdotal reports from online forums. I've experienced receipt and delivery problems with iMessage in the past, so I'm sure if I went looking for it I could find various online anecdotal reports of people having issues with iMessage reliability too.
It's not about Metrics. Ever since this whole RCS vs imEssage ridiculous argument came out since thanksgiving and the beeper BS, i actually have been spending time in android specific sites because I wanted to better understand it.
RCS essentially is basically a poor man's iMessage but can be universally used on any platform more or less so I can see its appeal even if I have had "RCS" in a better form since iMessage debut over a decade ago.
I spend time in these forums because unlike Android users here on Macrumors who sing its praises (LOL), they usually are far less biased about their opinions. Meaning when they are criticizing their device or a Manufacturer they are 9 times out of 10 going to be more honest than MR android users who even when you point out their shortcomings of the phone or OS they have to justify their phone choice because to them even with its issues "it's still better than an iPhone".
So no i don't have "polls" or "Surveys" but as you said above
1. You don't have issues....but many apparently do and have had issues for years.
2. Anyone can modify RCS as they see fit to do as they see fit which then would correlate that if RCS is able to be heavily modified you are going to run into issues. It is common sense to more or less expect issues.
iMessage does not have any major issue or complaints with people and I did my digging through a bit to the extent i have read about Android and RCS. Trust me, especially with this RCS talk, iMessage failures would likely be a big talk if it was having any issues.
Remember most of the world runs on Android, so even if 10 percent of the users complaining on Android are having reliability issues with RCS and 90 percent aren't, that's still a huge number. There's 3 billion Android users so that's roughly 300 million people or the entire size of the US population. I of course don't know the numbers nor do i really care because it's irrelevant.
I give you examples of people complaining about RCS and it makes sense WHY Apple likely has not focused on RCS because it's unreliability and lack of consistent standard (once it is modified it really is not standard similar to how AOSP Android is not the same as ONeUi on SAmsung even if it is based off the same software).
I'm not sure how that screenshot is telling me someone cares about what colour their messages are. He (I'm guessing he) seems to have it in his head that there are women who will dump him because of his choice of phone, and he is moaning about that, not that it's Apple who identifies him as a non-iPhone user. If his choice of phone really is the issue, it won't matter what colour his messages are as his date will see the phone in person sooner rather than later.
Because using his sad attempt at making a point, likely iPhone users (the dates) know what phone he is using because it is green thus fueling the idea that Women diss guys who have Androids. Which again really doesn't make sense because there would likely be more MALE ANDROID USERS than MALE iPHONE USERS since it runs on 70 percent of the hardware.
People on MR have literally made comments about their dating life or reading polls about their dating lives suffering because Apple "created" the green bubble stigma.
As i told the guy in the screenshot, i have a feeling a man with those kind of views has plenty of self-esteem issues and likely it has less to do with his color of his text and likely everything to do with him as a whole.
I'll backtrack a bit on the statement of *no one* really caring about the colour of their messages.
Glad you did so....because that's definitely true. People do care.
I'll admit i cared as a TEEN( 15-19) using Android but that's because Android to me at the time was a poor man's iPhone lol. I am nearly 28 now and while Android still has the "cheap/knock off feel" you can at least get a Premium experience.
I feel the same about Walmart. I will go out of my way to buy apple stuff at the apple store (60 mins away) vs walmart (15 mins away) simply because of the repuation walmart has even though I know it is the same price. SOmetimes you cant shake that stigma especially when it is rightfully earned.
I don't think they're locked in, but for me that's not the point. Like you say there are people who feel no need for another app, or in my experience people who are not willing to try another app, which isn't about lock in. And it's not my place to be a nuisance to them by trying to convince them to use another app. This is a good example of a scenario where things will be better when Apple adds RCS to so that cross platform rich messaging can happen through the default Messages app.
Apple adding RCS is really on a beneficial thing for Android users. iMessage is either very popular with US people or highly irrelevant with Non-American people as proven with whatsapp and other apps.
RCS coming to Apple only makes Android look better because apparently Android users get blamed for the poor quality videos or breaking the group chats.
So let's be real. Google/Samsung/others NEED Apple to adopt RCS because Apple's use of SMS actually makes their products look inferior. I don't think Apple necessarily went into this with that mentality.
I do think once they realized the initial status/cult following of iPhones with iMessage, and Facetime and the fact Android at the time had nothing to compete with it (and let's be real they still don't) they didn't see the urgency of anything else nor the need to bring iMessage to Android.
I haven't received any RCS spam either (been using RCS for about a year and I've had same number for about 15 years), but I've just done a web search do see there are some article on RCS spam so there is probably something there that needs addressing.
It probably does not help that many RCS implementations are coming from different sources so if you are using Google's jibe protocol you are less likely to experience spam (but then you run the risk of giving your data to Google) than if you are using a carrier or OEM manufactured version of RCS.
That's another thing and a big thing. Many people hate google so Apple also has a challenge to make sure that they are not linked together with Google and it's privacy concerns.
I also had no idea that Google was so heavily tied into EVERYTHING even when I am not actively trying to use their products.
Example: I love Edge on Windows but I had no idea it was Chromium based aka google has it's fingers in it somewhat (Shame, Microsoft sold out) and i was disgusted. I switched to Firefox on my Surface tablets only to discover firefox gets a handout for Google.
I hate the fact that Windows 11 has an Android subset because that means I am connected to google even when I dont want to be.
I am glad (As of now), Apple is not adopting google's standard for RCS