The steam deck is a steam machine, supporting it means supporting their direct and much more successful competitor. I understand the feeling since I have also gog games and a deck, I also understand why they don't want to do it
Yes and no. They are not in the hardware business at all, and they are losing customers because of it. So by supporting LINUX, which has been asked for ages, they will have the side effect of supporting Steam Deck and regain some customers.
I don't think it's black and white as it looks.
