If it's someone else's project, they have full authority to decide what is and isn't an issue. With large enough projects, you're going to have enough bad actors, people who don't read error messages, and just downright crazy people. Throw in people using AI for dubious purposes like CVE inflation, and it's even worse.
As far as I'm aware, most large open GitHub projects use tags for that kind of classification. Would you consider that too clunky?
I guess it probably leads to higher quality issue descriptions at least, but otherwise this seems pretty dumb and user-hostile.