Android was already a platform on life support. Google has wielded its authority to dictate how apps should behave such that even 3rd party stores do not stray far from Google's rules. Users of android phones have little hope to run a program from 5 years ago, or to roll back a bad update in an era full of bad updates.
People often lament about the early days of smart phones where you could put in a microSD card to expand storage and even move apps to it. But nobody remembers the details of how janky it really was. AOSP and Googles own Nexus phones never supported apps on microSD, it was added by other manufacturers and was not perfect, often apps crashed when running from microSD or ran slowly.
I'm not defending MTP either, it's a mess too and hasn't gotten any real multiplatform improvements since back when it was first being used for MP3 players.