Can't use 'native' as an excuse if your argument is it runs games better. Can't blame hardware if you're ignoring recommended specs from the developer. Can't say it runs the exact same if you have no evidence. -It's just propaganda. Can't blame nVidia for not being open-source when they lead the industry and profit from trade secrets.
~30 years in development and it's still not caught up to Windows or Mac. In some cases it's decades behind still. There's the kernel which gets a lot of support, SystemD, and Blender (which started proprietary). SystemD gets hated even though it's chosen by every mainstream distro (So much appreciation for the work that dev put in that he literally has no real competition!) SystemD even inspired the latest software coming from LGUG2Z (who has made the best dynamic tiling window manager for Windows 11).