It's getting dramatically better partially due to the steamdeck since it runs Linux. Some games might not still work in the future though due to kernel level anticheats mostly only supporting windows.
Maybe they will add Linux support in the future (for better or worse)
You aren't wrong but the misuse is within the bounds of what you are saying. They only need to make a reasonable effort to avoid directly surveilling conversations between two Americans if there's evidence available they are both Americans. They collect until they realize both parties are American and from what I understand those communications after the realization are not purged.
Additionally if you are speaking with foreigners they are also authorized to collect. The idea is that they can only use it for intelligence purposes but those data sets including domestic communications which were collected 'by accident' are exposed to the FBI for counter intelligence reasons. The problem is that the FBI has notoriously abused this and run searches against the database for domestic individuals for reasons other than counter intelligence.
It's a bit more secure if you use a proper write once DVD as well to read the live cd. It's a bit slower to boot but the best way to prevent persistence is always to make it virtually physically impossible by not having any physical storage mediums connected
Maybe they will add Linux support in the future (for better or worse)