Full disclosure: my disproportionate concern about this matter is almost certainly tied into my lack of self esteem and blind panic about embarrassing myself in a public fashion 
However, having said that, MN is literally the only forum that I have ever been a member of that doesn't allow for editing typos, poor grammar etc. after hitting the Post button. Whilst this can sometimes be the source of hilarious 'boil-in-the-vag curry' type humour, the constant vigilance that I have to exercise before posting, knowing that I get no do-over in the event of an egregious error, causes me to have a constant slight eye twitch. Anyone else feel the same, or knows if there is some arcane reason why the edit function has been disabled? My first-world problemometer is going crazy over here.
frantically checks OP for mistakes before starting thread