And I have to admit, I find myself agreeing with that list, most of those would be my votes too
Nope. I just tend to notice grammar/spelling errors, or tone things down when I may come off too aggressive, or sometimes remember something that I forgot I wanted to add while typing...or even spot that the comment I was replying to was itself edited.
So I go back and fix/add as I view necessary.
Also if you were dealing with intermittent aphasia due to actual scarring on the brain (been that way since early childhood) you'd probably want to fix things up when you notice some of it comes off not making as much sense as it should.