Earlier quoted context omitted.
Yep. I know Apple has little motivation to support such a project but it would be great to see them work with Valve on this. Having the majority of Steam games "just work" on modern Macs, like they do on the Steam Deck, would be fantastic.
I think it's more than "little motivation" if we're being honest. Right now Valve is quietly targeting MS' attempt to create a walled garden for gaming on Windows and (probably) cut them out. Their very clever approach has been a full end-run around the OS by using Proton, which I'm sure genuinely thrilled Apple... as long as Valve is only doing that to MS. Why would Apple ever invite Valve to potentially do the same…
Current MS' approach is to not do exclusives and sell all their games on every platform available except Apple's