I made a typo and went to edit my comment. I noticed there's no edit history. Is that something we want to add?

Pro's:
- helps prevent someone from editing / lying in the future
- keeps track for yourself prior versions, should you care for any reason

Con's:
- eliminates privacy, suppose you made a comment and felt you said too much or embarrassed yourself so you wanted to reword it. Deleting altogether is not your preference, you'd rather just take out some part. Editing here in secret is good so long as you're not deceiving people.