Comment by 4thguy

That will open a can of worms. For one thing, Valve will be accused of trying to create a walled garden. Plus there's the whole problem of supporting the back-catalogue as others have said.

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Maybe the best that they could to is to offer to distribute recompiled versions of the emulated binaries, similar to how they distribute compiled shaders. But I don't know if that would work, especially legally.