The other two main TL;DWs are that:
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He justifiably complained about PVP games having non-Linux-compatible kernel-level anti-cheat.
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His benchmark testing showed a big performance difference between Windows and Linux on his system, which has an AMD Radeon 7900 XTX. Being an admitted noob, he didn't notice that it was an unusual discrepancy and figured that worse gaming performance in Linux was "real," but a bunch of folks in the comments are telling him that RDNA 3 drivers have a known issue that means the card probably isn't running at full power and tweaking the settings can probably fix it.