You could make the same argument for rejecting all reports from third-parties in a pre-AI world though. It just seems like you're picking an arbitrary property to extrapolate a trend from when there are plenty of other similarly arbitrary properties you could extrapolate similar trends from. If I noticed that most bug reports that come on Tuesdays are low quality, I don't think it would make sense to have any bugs that get reported on Tuesdays get auto-closed, regardless of the statistical trend.