Is the MacOS equivalent what was deprecated in Catalina, ending compatibility with 32-bit applications?
It's a bit different. WOW64 is a compatibility layer that intercepts calls into system libraries from 32-bit apps and translates them into calls to 64-bit libraries. macOS shipped both 32-bit and 64-bit versions of all system libraries, no translation involved.
Crossover maintained compatibility with 32-bit windows applications even after Catalina.
> https://www.codeweavers.com/blog/jwhite/2019/12/10/celebrati...
Which is kind of funny because yet again windows was a better application in terms of longevity than MacOS native.