That's fine, but even among Android users, nobody buys these removable battery phones. It's possible there's a disproportionate reservoir of iPhone&removable battery-only consumers, but it would surprise me if the desire for a reusable battery were strongly correlated with being locked into the Apple ecosystem. If anything, I would expect the propensity to desire removable batteries is more strongly correlated with Android use.
There are a plethora of reasons to prefer one phone to another and while removable battery phones exist if that's a strict criteria for you the market of available devices is extremely limited. Consumers don't have a real choice here.
I would expect that one of the main reasons that people prefer non-removable battery phones are the engineering tradeoffs inherent in making a phone with a removable battery. They will have strictly less choice on this axis when they no longer have the option to buy a non-removal battery phone.
I think you are vastly overvaluing how much consumers actually value phone thinness. The majority of consumers use phone cases (most modern phones have a camera popup specifically to be better compatible with a case to this end) so I think what customers value the most is lighter weight - not smaller form factor. A replaceable battery does come with a slight compromise to weight but stopping the endless chase of thinness has several engineering advantages when it comes to ports and cooling.
