Disagree. “Trivially easy” must be set in common sense to the average consumer. It must be something that they can do easily without any guides or tutorials. Changing my name on Xbox is trivially easy. This[1] is not.
Disagreeing with your disagreement. How "easy" a tech-related task is to accomplish is determined by the users skills and experience, as well as software/hardware usage patterns that they've learned over the years.
Official guides/tutorials for enabling/disabling various functions exist for Google Play/AppStore too. Does that mean that one of the easiest ways to acquire apps that have ever existed is...not easy? Because there really isn't much difference between following a "how to login into my Apple/Google account" tutorial and "how to enable an XBox feature".
I'm 100% confident that if Apple told EU they were complying with the new law, with a system where you either have to run only sideloaded apps or only official App Store apps at any given time, but could reboot from one to the other, the EU would say "very funny, here's your fine".
There is a developer mode[0] so maybe that's their angle; right now nothing changes for regular apps but I can see a future API where banks, competitive games, etc. check to make sure you're not running any sideloaded code (not that that's a big problem, as iOS 15 is still unjailbroken due to the extreme advancements in the OS security model).
[1] https://docs.microsoft.com/en-us/windows/uwp/xbox-apps/devki...