[hamdingers]

I'm interested in alternate explanations if you have them, to be clear this is only my theory.

While Valve might make up a big part of CodeWeavers book of business now, that was not true when the original contract was signed.

[int_19h]

The alternate explanation is that it's rather pointless to integrate it because all new Macs are ARM, and there are basically zero Windows games compiled for ARM.

[hamdingers]

Not likely considering Valve are working on an ARM version of proton in the open, have published test results for x86-64 windows games playing on proton-arm64ec-4, and there are credible leaks that the Steam Frame uses an ARM cpu.

If anything Valve is moving towards ARM and taking the library along with it.

[int_19h]

Then it will probably happen after they get it polished on Windows.