@nprofile1q...I do see an increasing amount of developers fixing Linux-specific bugs in their update logs and actively marketing their games as Deck verified, so in that sense it does seem to grow. But indeed, most of it is still unssuported and we're a long way off seeing that changed.
Linux was stuck in the cycle of too small market share, therefor no devs are interested, therefor the marketshare didn't grow much. Valve seems to have broken that cycle a bit, causing devs to care more, causing more people to give it a chance. But it'll need time to really get a foot.
I do think we're at a point where it's usable for mainstream people in general, but only with a big but that we need to be honest about the limitations and accept that not everyone will accept them. Some will be fine with it and just play another game until there is a fix, others will find it unacceptable and skip Linux for it. As much as the mainstream likes to overstate the issues of Linux (especially when compared to other systems that are deemed good enough), we Linux-fans tend to understate them. Personally, I think some nuance and realism is important to improve and gain long-term stability for gaming on Linux.