I can remember the articles and that are linked, but not the discussion about the articles. This sucks since the discussion adds nuance and background to the article that is helpful.
Have other people noticed this, and if so, why do you think it happens? Is it a UI issue (maybe mental energy is wasted keeping track of where we are in the comment tree)? Or is it a cognitive issue (just pay more attention)?
I use Histre to save and tag useful comments if I think I'll need to refer to them again.