I actually use the ability to install custom software on Android. I actually use the ability for Android apps to bundle JITs, and language interpreters, and other things that allow you to extend the app at runtime. The Apple walled garden would be unusable for me. And moves like this one to turn the Android ecosystem into the Apple ecosystem will generally be regressions.

If anything, I'd like more openness in Android. For instance, apps should not have any control over what data I can back up; I should be able to back up every aspect of every app, restore it to a new phone, and apps should not be allowed to care.