@dk
Once again, one could always go ahead and implement this, although I'm not sure of the implications for #ActivityPub and federating revision history. Delete and re-post is hard enough to ensure, with some instances out there not respecting deletes. I would suggest, "revise well before you post" is better than "ah, i can always edit it later"
It's important not to ask a micro-blogging platform to be the kitchen sink, but rather consider which federated (or not) platform is the right tool.