I feel like you’re overestimating the number of people who buy a Google or Samsung device because they want to install third party apps. A lot of them buy an Android device because they just don’t like Apple. Most folks don’t install anything from anywhere other than the Play Store because they don’t even know there are other choices.

In general, people’s preferences are most often born from whatever their first device was, and nothing more, with little interest in what they can do with it other than what’s required of them.