Allow content to be edited when it already has comments?

Question

Software design

For example, a post, a user made a post, users wrote down their opinion, and then the author puts a kui in the post and that's it, the comments are no longer appropriate for the post.
The same goes for any other kind of content that is publicly published and then edited.
For example, the answer to a comment, but the author then corrected the main comment, then the answer is irrelevant.

Thinking about the solutions, I came up with several solutions

1 - delete links after the update, for example, comments to the post
2 - block the ability to edit if there is at least one comment
3 - store several versions of the post, after editing the post will have several pages with its own comments
4 - wait for approval of the edit from at least 51% of commenters. That is, a post, 10 comments left from unique users. It is necessary that 6 of them approve the edit

. I am sure that you can come up with at least as many more, this is the first thing that came to mind.
This problem is ubiquitous, but I have not seen the implementation of its solution anywhere and ever.

What other options are there?
Which one do you think is best and when?
Why?

Answer 1

The simplest (and probably the best) is the ban on edits after adding a comment.
In general, you would have to ask users. Specificity - it is such a thing. What is good on one site may be bad on another.