Without that, a lot of apps just don’t behave right,

Agree with what you said. And if I may add a little? Apps not behaving right extends to things average people see as essential in thier life. Like banking apps refusing to run on "untrusted devices".

Techies can get around most of it. At least today, maybe not in the future. For example use the bank's web site directly not their app. But my nontechie friends have no idea. From their perspective, something like an alternative to Android simply doesn't work for what they are used to.

Vendor lock-in.