I can see both sides of the issue. Sometimes we post something and later find out that we were all wrong and would like to have a do-over. And often (if you try to use this sight from a phone), spellcheck twists a lot of the words into something totally different and it's too much hassle trying to fix the misspelled words and wrong words with the phone so you wait until you can get to a laptop or desktop that works with this site. Probably the main reason I rarely use a phone to post on this site and never bother even trying to use a phone to moderate on this site.
On the flip side, the are a few people who decide to leave our fair company and then delete all of the text in their posts. It tends to leave some holes in topics and is more of a pain if they were the topic starter. It doesn't happen too often but once in a while it does.
So I can see both sides of the issue.