I got my first mac a few years back off the side of the road, a 2009 imac that didn't work. I went to a lot of trouble to find and install the most up to date mac os I could get on it for the challenge and because I'd never used a intel mac before.
Believe me, they absolutely did just flick a switch. everything about steam worked fine until the day it didn't even load up. removing support is one thing, actively bricking your product is a total scum fuck move that is just common practice in gaming now.