Lots of people just don't game at all. Also, a lot of people like me prefer different gaming and work setup (and different rooms) in order to achieve better work-life balance. I build games on my M1 machine, just don't play on it.
To be honest the last time I used a mac was I think a decade ago so they're just so unknown to me at the moment, but everyone else seems to love them so I'm quite tempted
You can't dual boot so you can't natively run the game you're working on. The graphics are integrated so you can't test on a PC GPU. VR dev doesn't work at all.
Lots of small things but if you also have a PC its not so bad unless you need some library that just doesn't work.