IMO there should be a way to allow power users such as yourself to customize your phone, such as how Google allows side-loading. But we can see that based on how niche side loading is that mass-users oriented businesses like Spotify and Twitter would not be happy.
As for users like myself, I'm very happy that Apple intermediates my relationship with big businesses, because in the sphere of negotiation and leverage, big businesses like Walmart or Amazon would win every time for people in my family. They will auto-accept all terms.
Any user should be able to walk away from the original hardware vendor, never contacting them again, and still be able to use the product in a normal way. Otherwise you bought a service, not a product.
As for users like myself, I'm very happy that Apple intermediates my relationship with big businesses, because in the sphere of negotiation and leverage, big businesses like Walmart or Amazon would win every time for people in my family. They will auto-accept all terms.