I learned so much over the years abusing Cunningham's.
Could have a presentation for the C-suite for a major company, post some tenuous claim related to what I intended to present on, and have people with PhDs in the subject citing papers correcting me with nuances that would make it into the final presentation.
It's one of the key things I miss about Reddit. The scale of Lemmy just doesn't have the same rate and quality of expertise jumping in to correct random things as a site with 100x the users.