Only if you expect developers and/or studios to work for no pay.
Why do you think we live in a world where you need an internet connection to play a single player game? Developers need a way to be sure you've paid up.
You keep bringing this around to revenue, but Apple could solve this problem if they didn't benefit from the status quo. A company 10x smaller than them did it, a company with full control over their hardware stack has no excuse to drag their feet and copy Open Source's homework.
What you’re missing is that Apple has their own proton that they’re using to help developers port their games like what Valve is doing with proton. Imo most of Apple still hates games if it didn’t bring in so much revenue. Now we have a small team trying to change that at Apple similar to how WSL for Windows came to being. I just hope that the higher ups continue to support and promote Apple’s “proton”
Well Apple and Valve are doing exact opposite things with their tools. Let me explain.
Valve runs your windows game unmodified. There is no 'porting process' and there is no 'port'. As person working with large publisher I am still in shock and disbelief that it is legal and works well in practice but here we are. The funny part is when developer of windows version of a game is asked 'how well do you support Steam Deck?'. And developer has to do windows version changes and produce new windows version that has tweaks for Steam Deck.
Sideloading makes piracy a service problem instead of a freedom one, and Apple knows their service can't compete on an unstacked deck.