True, it's momentum and marketshare. Don't let survivors bias cloud your mind; resistance to change keeps a lot of people in their current behaviour (using whatsapp) imho it's the main reason whatsapp is so sow to adapt new features: they don't want to upset their demographic. everyone insisting on only using whatsapp in my environment is above 50...
Now, what is the reason Snappchat is so popular in spite of that? And why is the owner of facebook pouring resources in a seperate app, wich does include all of this bloat?
You are forgetting many things:
1) fb bought whatsapp AFTER it grew to the monster it was.
2) fb uses the messenger app now as the experimental messages app where they can go crazy and try whatever they think it's cool but no one really uses
3) you live in the us probably. Whatsapp is used by ALL demographics globally and it's the main app in many countries. It took over blackberry pin and all that it entails. Carriers even let you use it wout consuming your data in it
4) snapchat is used globally but not in the same size/way as the us. And is still not close to other apps like whatsapp in terms of use.
5) it's not survivor bias. It's global bias AND UNIVERSALITY. Even snapchat has it. No matter the OS you can still receive the same thing. Messages is still the most used app for the iPhone because texts are unlimited nowadays and not necessarily because of iMessages. One is an adjunctant by os for increase use.
Apple reunion probably went like this:
Hey let's add all the features of all the IM apps in our messages app and let's call it amazing. It's way too much and no way to turn it off and no way to universalized it. If they really had though it better they could have transformed their videos and other stuff into gifs or something universal for the nonios side and calm down w all the extra tacky stuff or a way to turn off certain features. This is just an attempt to try to seem like it's an innovation in the 'major' release cycle.
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TL;DR: GET OFF MY LAWN!!!
I'm considered a 'millenial' but maybe I'm too hipster for this.