"While the evolution of WSL... cut the need for Multipass on Windows"
What's the need to begin with? Is anyone doing anything real with WSL besides "porting" things you can already run? Am I to go and install Windows because WSL will now run... actually I don't know. Now a super-duper Windows and Mac emulator for Linux would be nice, but the current trend is to achieve Linux without having to contribute to Linux by feigning "OSS" support while doing nothing but making their own OS's better (Mac & Windows). What I can't understand is that if bridging a divide requires more things Linux, why doesn't Linux just bring them both to it?
While Multipass seems like a 5th element, I'm not sure I'd bother as Mac is Unix enough (although I don't have a MAC so :-/).