NixOS is the best operating system I absolutely cannot recommend to anyone - Anurag Singh
(www.xda-developers.com)
Do you have some specific threads in mind? Maybe I'm lucky to never click on the bad ones but my experience is that nobody is more cynical regarding Nix/NixOS jank than the long time NixOS users. You might not always get the answer you want, because it is very jank and doing some things will get you into trouble. But people pointing that out isn't the same thing as gaslighting.
Guix SD might be worth a look, it seems to be just straight up better in many technical regards. It has no flakes, comprehensive documentation and a blessed way to manage user homes. At least as long as you don't really need WiFi of course...