Allowing side loading is a mistake.
Big companies will start distributing their software outside the App Store to make more money and the user experience will suffer. Here's what is gonna happen:
1) Users won't be able to manage all their subscriptions in one place (you'll have to manually keep track of side loaded apps subscriptions separately).
2) Users won't be able to install every app from just the App Store anymore. Instead they will have to find stuff on Google, which will be full of sponsored links that will potentially install garbage and malware on their phone instead of the software they are looking for.
3) Users will have to put up with several competing payment processing systems, some of which probably won't even accept Apple Pay but will require the user to give away their credit card info to access.
And I'm sure there's more that I haven't yet thought about.
I hate the EU for these stupid regulations. I suspect big corporations are actually behind this: somebody must be getting paid by Google, Epic, Microsoft, Adobe etc... to make this happen.
People shouldn't be cheering for side loading to happen: you are cheering for the fact that the EU is taking away power from Apple and redistributing it across multiple big companies (Google, Epic, Microsoft, Adobe...). Are you sure that giving more money to Google instead of Apple is a good idea? And on top of this, how can you be happy about having to deal with multiple payment processing systems just to use your favorite apps and services?
People, this is DUMB. Wake up.