As someone who's been commenting on various sites for 20 years, I consider my comment history to be the very clearest representation of self and who I am. Like if my progeny ever wanted to know about me they could go read what I've written over the years. But then, I never crap post (some may disagree), and I usually always write sincerely. So the idea of shredding all that is kind of startling.
Crap is definitely measured by the eye of the beholder, and not the depositor :D
Of course these days with AI able to do analysis of everything we've ever wrote, duplicate our speech, and mimic our look, we may find out that leaving all this information in public was a foolish mistake.