Think of the situation with Chinese non-Google phones. You install your favorite app and it crashes on launch because the manufacturer messed with the system AP

Think of the situation with Chinese non-Google phones. You install your favorite app and it crashes on launch because the manufacturer messed with the system APIs. You run another app and it gets killed in the background, not receiving messages, because it's not on the list of your phone manufacturer partners. This is the situation with degoogled Android today - a huge compatibility mess.