[cryptonym]

This still is a walled garden. Store from os or manufacturer. If you try to install a third-party you may end up with poor user experience from the os.

Time to split app distribution from OS. Making it mandatory to allow other stores, with first class user experience, and not set their as default one.

[smegger001]

I installed the amazon app store on my android phone and it worked fine same with installing FDroid. all i had to do was check a box when prompted.

[cryptonym]

Sure but it's only you, already knowing about alternative stores, and with your specific device.