This is not about demanding games, but false positives from Deepguard.
Plus is clear you taking this personally and going off topic at this point, what I stated is pretty much common sense.
F-Secure has known issues with Games, and is bad advise to suggest it in a Gaming Rig for an average user, which when faced with the issue won't know what to do nor what happened.
I personally ran into issues while using F-Secure myself, in which Deepguard detected one of my games as malware (no warnings from F-Secure), Steam itself throws the error 51 (which is an access violation error), there's more than enough topics about this on the Steam Community (on multiple games) which helped me figure out that Deepguard was causing the issue
This has never happened with any other AV so far, and I hope you not trying to blame my PC for an issue with the Behaviour Blocker, I'm one of the lucky few that can play the latest Cyberpunk game on max settings and stable framerate.