Skyrim runs well [1] on my M2 mac mini through crossover and rosetta. So most older games will run even better.

The real question is what happens when they drop Rosetta. They promised they'll keep the APIs related to running 32 bit games but can we trust them?

[1] Not at 8k 240 fps of course.

Porting games natively to macOS is a waste of developer time. Apple has already depreciated vast swathes of 32-bit games that were never updated to support 64-bit x86 or Apple Silicon. Developers that give macOS the same level of attention as Windows don't get the same level of support that Microsoft offers in return.

Not to mention that Mac owners are a minority share of the PC gaming market. Linux has the right idea, if you don't translate the games then you'll never have true preservation.