> Steam generally supports macOS, Valve spends a lot of time on the platform so I think you're dead wrong there. The titles that thrive on it target its rich audience.

Steam does run on Mac but the client and the game library are 2 different things. Not sure if you noticed the shrinking library and Apple's attitude towards the Mac games. They don't care about it. 0 support for 32bit games migration, unconventional api support (compare the usual d3d/vulkan land). Unlike ios, Mac does not have a hold on the game market