Oh, come on.
It's clear to me that a link with a description that lets me make even a 50%-accurate judgment, let alone a 90%-accurate judgment, of whether I'll like it is far more useful than a link with no description at all.
Do you disagree?
No, obviously not, I spend a fair amount of cognitive resources every day trying to sort through online content and am partial to norms conductive to that purpose indeed.
I just interpret "knowing without following the link" as "at least 99% sure it'll be worth it".
Sharing interesting links via the discussion section seems to have too much overhead. I suspect we all find things that are quite interesting but don't bother to share them on LW. This is an experiment to see if a dedicated thread can work better.