No offense, but you sound like my dad when I was first learning to write; he used to tell me that I should never need to erase becaues I should take my time and form my letters perfectly the first time. Unfortunately, I wasn't a robot then, and I'm still not now. I still make tons of mistakes when typing up posts that I don't catch in the preview screen (And yes, I still have mistakes that slip through on me, even though I average 3-4 previews per node.)

I think it is arrogant to force root-node authors to "be perfect the first time." Nodes aren't doctoral disertations, and node readers are not English proffessors. While you may type up "The Perfect Node" each and every time, I usually appreciate the fact that PM is not usenet, and I can fix my typos when I notice them after submission. I would especially appreciate the ability to do this anywhere on the site.

Update: For instance, I accididentally hit submit before I realized that I forgot to add the HTML to split this node into 2 paragraphs. It happens.