I really like the social features like comments. However, if I make a mistake I cannot fix them. As a notebook is a mutable resource it would make sense if comments were too. I quite like leaving comments around as they are usually insightful and bring alternative perspectives to a work.
I made a typo in https://observablehq.com/@tomlarkworthy/reconcile-nanomorph (end of notebook) and my only recourse was to self-correct myself.