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It’s not just 32 on 64 bit, new Macs use ARM64 processors so x86/x86_64 code is effectively obsolete on Mac. I would love to see Valve pour resources into a cross platform x86 on ARM64 emulation layer though, it would benefit Linux as well.
The ARM translation may be less of a problem on macOS because of Rosetta. That said, integrating something like Box64 would absolutely benefit both Mac and Linux.