This seems like right approach, although I'm not a purist anyways. I have a personal policy not to buy games unless they have Linux support, however I have decided that games that officially support Proton are good enough. At the end of the day I just expect that it works, if the performance or something is terrible I can always refund it.

I don't really care what tools/APIs the devs use as long as it works well. If they target Windows APIs but use Wine that is fine with me as long as they test it and make sure it works.

And as you said, if this allows more people to game on Linux it makes the Linux experience more important to the game developers. If they decide at some point that Wine is holding them back they will make that switch when the investment makes sense. I think that the most important thing to the long-term success of Linux gaming is ensuring that companies think they can make money there. If they think they can make money then they will continue to make games and put effort into making sure that the games work well.