And what in the new law would prevent them from continuing to make the same "reliable without surprises" iPhone experience you seemingly enjoy? I don't see anything that prevents them from saying "We can only guarantee an Apple-level experience by using apps vetted by Apple and download directly from the official Apple App Store." Most companies that I'm aware of don't have to warranty issues arising from after market/3rd party accessories. I mean, is Apple responsible if I download software from x company on my mac from x company's website? Why isn't the laptop ecosystem "all messed up" if you can install anything from anywhere on your macbook and use any payment processor? The only thing this really would do to upset Apple is taking away some of their walled-garden revenue, like processing fees. I'm not sure why a watch or phone or tablet needs to be treated opposite of other traditional computing devices. Just because it's a different form factor?
I'd argue appliances should be walled and computers shouldn't be.
I think the form factor is very relevant. A MacBook is treated like a computer. A phone is treated like an appliance.
Most phone/tablet users want the convenience of modular functionality without vetting the source. Said functionality should also be easy to discover and add/remove, hence app stores.
Whereas on a computer, app stores are ignored if they even exist. Most people install after doing their own Googling or seeing it run on another MacBook.
In my opinion phones intended for general purpose computing should have distinct marketing and different software-related features.