Good read. The kind of read that needs some processing time, there's a lot to unpack in this article.
Read it, it's worth the time.
Didn't know about Bottles, Cool find, may have to test it out.
Given their rivalry with Valve (I'm sure Riot see it as a rivalry at least, Valve probably don't) I wouldn't put it past Riot to want to avoid SteamOS and Linux by extension until significant market share is available.
To be 100% honest, probably not, and you may need to confirm with someone who knows Valorant. The big issue is anti-cheat, the detectors in use for major multiplayer games tend to lose their minds when they see Linux as they're typically only built for Windows. Other than anti-cheat, it wouldn't surprise me if it played better on Linux. Some of the low level magic has improved a lot in recent years, but official support is mandatory for multiplayer.