Meh, useless purity check.
Gaming on Linux is hard because there's not one Linux, there's tons of Linuses. What version of the glibc/libstdc++/mesa/xorg/wayland/kernel/drivers are you running?
The Linux ecosystem is fragmented in such a way that only open-source and an army of volunteers can really work around. It is really not binary-friendly at a fundamental, philosophical level.
(You're not going to get game companies to open-source their games, except as an exception, and after their economic life is finished)
The Steam Deck provides one well-known hardware and software platform that a vendor can reasonably target. Don't expect much more except by the most dedicated developer.