That does sound good and of course valve are interested in getting it more widespread and compatibility down.

[s] My only concern is that "out of the box" is what most people expect. Not all gamers would be knowledgeable about how to compile proton for their vanilla Ubuntu. Although who knows! [/s]

Still I would love something for MacOS but looks like this would be a pain to compile.

Edit: You can ignore 75% of that