Steam is not helping. Any game that only ships 32-bit x86 binaries should not be listed as having Mac support. Apple not only doesn't sell x86 Macs anymore, they don't even do security updates for Mojave. If you have an Intel Mac around, Bootcamp likely makes for a 10x better gaming experience.
I feel like Apple are really dropping the ball here. There's an amazing catalogue of classic games that could run really well under a hypothetical 32-bit x86 Rosetta. But Apple is doing Apple, and asking you to use their Game Porting Toolkit instead... Basically telling gamedevs, if you're not ready to go full Apple, don't go Apple at all.