MacOS stopped supporting 32-bit with Catalina and, according to appleinsider.com, older games won’t work on Catalina at all.

Wouldn’t the alternative be losing a LOT of old games on Steam?

I can (anecdotally) confirm the overclocking sensitivity. Although it seems to be more that this game just REALLY pushes hardware if you let it which is naturally gonna draw out overclocking instabilities.