If you need to lecture me on how much better it is for me, then maybe it's not?It's not simpler for you. Neither require any action on your part.
How to I install Microsoft Office when it isn't available on the Apple Store? How do I decide which stores are safe and which are not? How do I make sure that applications I install from one store can interact safely and cleanly with services provided by apps from another? Have you seen the number of switches and controls and privacy and security options in Safari now? There is no way opening the platform to third party nonsense is going to be simpler or even equally simple.
It's going to require research, it's going to require a set of controls, its going to require setup, its going to require exceptions, and its going to require continuous maintenance on my part. None of that is simple. It is a hassle I specifically pay Apple to protect me from and one that I'd like them to continue to restrict rather than loosen.
I understand some people want complete freedom on their devices. There are ecosystems that are closer to that ideal. There can be future ecosystems that get even closer. If this law passes, then the simpler ecosystem I prefer will become illegal. Not simply more expensive, but illegal.