Re: Minority of market
While iOS may have a minority of the Mobile OS market, I would expect that of the actual hardware market that Apple are doing quite well (very well indeed before Huawei started being such a big deal).
While anecdotal of course, i see many more people with a single model of iOS phone, than i do within an entire brand of Android phones.(for example, lots and lots of iPhone SE's, but relatively few Samsung phones)
What is also worth remembering is, Apple hold 100% of the iOS market. At least with Android if you decide that you don't like the way Samsung (for example) are doing something, there are alternatives.
(i had a point, but i think it got away from me)