I also find it good with higher level IDs to help pick out the ones that people have (potentially) been able to ID enough to disagree with. Of course, there are also ones that just started with a wrong ID and got kicked up higher, but it still seems to me to tend to have a higher percentage of ones I may be able to help with than the general population at that level.
As for the most useless feature, it’s probably one I don’t yet know about - and maybe if I found it, I’d discover it’s the most useful!
I’m likewise not a fan of clickbait-ish titles, but such a question does have the potential to bring ‘more obscure but potentially useful if people knew they were there’ features to light.