https://www.gamingonlinux.com/2021/07/faster-zombies-to-steam-deck-the-history-of-valve-and-linux-gaming/

I find this very weird because the Linux ecosystem is not standardized, unlike Windows or Mac. This means that there is no guarantee that Steam will run on all Linux distributions, and users are more likely to find bugs running Steam on Linux than on Mac or Windows.

I kind of see your point but it can also be said that Linux is standardized unlike Windows and Mac and I find it funny.

On a more serious note software fragmentation is not as much important for running video games as it seems due to the monolithic nature of the kernel and other arcane reason. Games wants to use the graphics card and don't care much about Linux hundreds of option for a PDF reader or file explorer, there is basically one driver for vendor that everybody use and that's it. There are some problem with fragmentation but steam has solved them with ease (Steam Runtime and in a way proton, I think Liam made an article on what really is Steam Play). The result is that the world of recent distro is less fragmented that let say windows with people still using 7.