Many games only work on Windows because their anti-cheat is kernel-level, and even if you ignore these games, you will still run into all sorts of issues with proton or rendering APIs. I would even go as far as asking how many games from the top 100 played games on Steam actually run on Linux natively, without compatibility layers. So no, Linux is not quite viable.
Only AAA games with that anti-cheat crap don't work on Linux, most stuff does. Whether or not it needs compatibly layers is irrelevant, many Windows games also use compatibly layers to some extent, you just don't notice it.
There's no shortage of games you can install through Steam on Linux. You need windows for GTA6 or the latest CoD or whatever, but saying Linux isn't viable at all is silly.
Some people prioritize freedom and privacy over being able to play the latest mindless clone game of what came before with slightly better graphics, but for those that don't, Windows and needlessly invasive AAA games are indeed a good option.
That's not true at all. AMD cards and drivers exist and are often competitive with Nvidia cards. Not to mention, the difference in FPS is often not as noticeable as you probably think.
If you're installing untrustworthy, closed source, proprietary third party kernel modules into your untrutworthy, closed source, proprietary operating system, why even bother with LibreWolf? You have a unambiguous revealed preference of not caring about your privacy or your security at all, regardless of what your stated preference is.
You seem to care about privacy to the point you risking Firefox selling your data based on a misinterpretation of a badly worded TOS, but have no problem letting random closed source binaries hook into the lowest level of your closed source OS which itself is known to be a privacy nightmare and not at all trustworthy.