I think a good solution would be to make the bar higher to submit an issue. Disable Github Issues entirely and only allow true mailing list type issues that are significantly "uglier" and less "normie" friendly.
If you want to raise the bar, I think a reputation system would be better.
I remember it working surprisingly well, especially browsing at 1 or higher, and I've never understood why no one has replicated it. 'Karma' systems must get better engagement.
Github issues is already a pretty high barrier (you need a github account to post).
I make software targeted at a technical audience, and only 10% of bugs are reported on Github. So by requiring Github you already lose 90% of potential bug reports.
(numbers in this comment are very rough estimates)
That's the goal.