Yeah, the problem is a lot of this stuff becomes essential rather than just convenient, so what’s a small bump for someone with more mobility becomes a fall off a cliff for a quad.
IOS has better accessibility tools built in then android. (And lollipop broke some of the ones it did have.)
Here’s how a person without functional arms uses a touchscreen. (This is a Wall Street journal article from October 2014.) You’ll see most people are all IOS, and the one person who has a Samsung phone mentions that many android apps are unusable for her–she has an iPad as her tablet.
Anyway, I use iOS now, it would take a killer app for me to try android since I already know a lot of stuff will be inaccessible to me.