That's a little disheartening to hear that iOS still has not really evolved much.
In the little over 3 years I have had Android, it has really changed quite a bit.
But I have to give credit to Apple on the software side. iMessage and Facetime have become sort of the standard among my family and that is why I have heavily thought of switching. Also as much as I love google, I really hate feeling like i'm being recorded with everything I do from the location history to voice responses to even the order in which applications i used at what time of day.
I have heard people say that the iOS apps are more polished then their Android counterparts but I have yet to notice it. I wish someone would do a comparison video.
Lastly, I don't really customize my phone all that much but I do agree with the screen. The S7 has a gorgeous display. I wonder if i would notice the difference looking at my iphone 6.
You will definitely notice a difference, and if you're coming from an S7 to an iPhone 6....I can only question "why"
S7 is a newer, superior phone in every way from the (much better) display to camera to battery life (along with fast charging) to little things like much more ram, along with true multitasking (which only iPads with 2GB of ram do on the iOS side) and having expandable storage. But if you have an S7 you already know that.
If you're used to Android, you'll probably miss all the customization you can do as well. I know you say you don't but hey, real dark themes that take advantage of OLED tech is pretty nice. Worth mentioning although iOS has widgets and their use has improved with iOS 10, it still is not implemented as well as it is on android (widgets are awesome. Anyone who uses macOS will attest to that
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As far as polish goes, iOS is better supported but in today's day and age they are both equally polished, in some ways iOS is marginally more polished in other ways android is marginally more polished. They each have their pros and cons but overall they are pretty much on par now a days. Android has changed significantly and become a much better operating system in the last few years and iOS has simply become more refined. Apple knows the core experience of "straight forward, simplicity" is what it's user base respects and they have added to that. You can also now get rid of (some) iOS bloatware and stock apps with iOS 10 from your home screen which wasn't possible when you last used iOS. That is a great albeit small feature for some people.
If you're curious about iOS and you want a secondary device then sure the 6 is fantastic. Seems like you can get a very good deal for one, and it runs iOS 10 buttery smooth. It is a pretty effiencent OS and is very well supported. Safari is a good browser, most of the stock apps are adequate and work well, it's easy and simply to use and if you have family who uses iOS devices in other regions then iMessage and FaceTime can be useful features. Hey Siri is a useful feature but not so much on the 6, also you can't use raise to wake on the 6 (whereas you'd have AoD on the S7) and the finger print reader is faster on the S7 too.
Oh and you lose the water resistance, a better, faster cell phone modem (I mean, people still make phone calls on their phones right?), and better wifi.
But that's partly because you're going from a phone that is the (currently) most modern galaxy to an iPhone that came out in 2014 and is now 2 generations old.
You'll eventually get used to the iPhone 6 screen after using it exclusively for a few weeks, but oh boy is it a downgrade lol. I'm just not sure what the attraction is for you in going from an S7 to an iPhone 6?
