Regarding your comment about older posts - My understanding is we can edit our older posts until they are 7 days old, after that it can only be deleted.
To be honest, after 7 days, I've already forgotten about the post. Are you looking to make changes after the 7 days?
Yes, post creators should be able to edit their work at any time.
The simplest case for this is correcting errors that were initially unnoticed, or updating content.
My specific case is the need to maintain and extend tools. For example, as I write new articles, I want to be able to add them to this table of contents.
This editing functionality was promised in Hard Fork 17. We are still waiting for it here at Hard Fork 19.