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That’s because normal Linux won’t be as optimised but unlike Valve they don’t want to put actual work into optimising it.
Less “not optimized”, & more “not supported”; IE, accelerations that don’t turn on, because companies like Intel, Broadcom, Samsung, & NVidia, have a long history of only giving preferred partner devteams, prerelease hardware access, much less any peeks at unobfuscated firmware.