Valve has remained hilariously silent about the Mac, to the point where it is likely detrimental to them.
Apart from having said nothing about the M1 Mac, although they did add native support for Mac games in September last year, hidden in Steamworks patch notes, any dev releasing a Mac game has to flag that it is a 64 bit game, otherwise we get the lovely 'This game is incompatible with Catalina or above' message.
Steam itself had a bug where the 64 bit Steam client would automatically update to the 32 bit version on a new update. That took until April 2020 to fix.
nVidia's talked more about Mac gaming than Valve has. And that's crazy.
Apart from having said nothing about the M1 Mac, although they did add native support for Mac games in September last year, hidden in Steamworks patch notes, any dev releasing a Mac game has to flag that it is a 64 bit game, otherwise we get the lovely 'This game is incompatible with Catalina or above' message.
Steam itself had a bug where the 64 bit Steam client would automatically update to the 32 bit version on a new update. That took until April 2020 to fix.
nVidia's talked more about Mac gaming than Valve has. And that's crazy.