Apple certainly could be hemmed in on clear areas of conflict like Spotify.
Opening the platform is not traditional antitrust because consumers like it this way - it’s more about charity for the competition.
Fragmentation: If Apple competes well there won't be any because their app store will be the best on merit not at gunpoint.
Safety: Don't sideload or install unsigned apps. Keep your phone up to date. This doesn't change much except possibly give you the option to be unsafe.
Payment processing: We already see integration with Cash app, Google wallet, Apple pay, Stripe, PayPal, etc. This is not an issue.
Because if you ask me, my guess is that the average Apple consumer couldn't care less if the platform is opened up or not.
If it helps you sleep at night, keep thinking it’s a very small minority. It’s really not.
When your immediate response is to have an emotional outburst and tell people they’re stupid, it actually shows you lack intelligence.