If many people report a problem, the correct response is never "no, you're wrong, that's not a problem". There's no technical aspect to it, that is just common dececency when talking to another human.

That's the culture issue with Nix.

It doesn't mean an issue will never be "wont-fix" or that a issue won't genuinely be a skill-issue. It means it's not hard to say "I'm sorry, I disagree with adding support for that feature" or "here's a tutorial for [skill issue]" instead of saying "no, you're wrong, what you reported is not a problem". When you mention editing the CONTRIBUTING.md you're not offering help, you're just setting up a punchline for an "[but even that wouldn't help this IDIOT]". There's no sincerity, no sympathy or attempt to understand.

I don't know how to explain it any more clearly... you're not convincing anyone to help you on those "big issues" with words like "you really should have discovered the issues tab".