> Now imagine if you could get rid of all that legacy crap to make it work in the first place.

Yeah, and someone will wake from the dead and rewrite all the programs that run the world, written 20-40 years ago, that are to a large degree perfectly working under these compatibility layers.

You should be eternally grateful to MS for dedicating tons of money and some of its best people to maintaining backwards compatibility.

Apple can only afford it because pretty much nothing critical ever ran on macos.