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.

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hamdingers 4 days ago | parent [-]

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 3 days ago \| parent [-]
		Then it will probably happen after they get it polished on Windows.