Important to differentiate microblogging and long-form. Bluesky, with its character limit, can get away with no edits. Substack, being longform, cannot, and so they have always allowed edits. Not seeing comments here make that distinction, and its critical. 

Long-form: there is just no way for Nostr to present itself as a viable option for creators and not allow edits. 

Microblogging: yes, a case can be made.