x86 translation will be slimmed down but remain for compatibility with the Game Porting Toolkit[0]. Their reasoning is likely that they want to limit the set of libraries that they ship x86 slices for as much as reasonably possible because each supported architecture multiplies surface area across the entire system.

It’s also notable that virtualizing macOS on macOS has now been officially supported and easy for several years, so it’s possible to just spin up a VM running an old version of macOS for software that requires Rosetta. Some kind of containerization probably isn’t a bad idea in that situation anyway, as software that’s gone so long without updates likely carries a number of vulnerabilities.

And on that note, the highly permissive state of desktop OS security as it had been for the 2000s and 2010s was never going to last. It’s been proven repeatedly that third party software must be treated adversarially, both because the big guys like Adobe can’t be trusted to keep their fingers to themselves and the little guys and FOSS projects sometimes fall victim to supply chain attacks. The OS must try to limit the blast radius where possible.

[0]: https://developer.apple.com/games/game-porting-toolkit/