Feature summary:

Edit summaries should be editable.

Suggest allowing changes to be made to edit summaries, after their submission to the database, by two groups:

1. The editor who made the change.
2. Trusted users (i.e. admins)

If you want changes to edit summaries logged in a log 🪵, an "edit summary change" log might be required. This would list the change made, the old summary, and the new summary. Ta da.

Use cases:

Adding a brief edit summary tells other users info.

• User submits no edit summary, then think it's a good idea to go back and add one. They couldn't before, but now they can.
• User submits no edit summary. One can be added by a trusted user (or bot -- AI powered bots are very good at sifting through vast amounts of textual information like this)
• Users submit dishonest edit summaries. Someone else can correct their dishonesty.

Benefits:

Would improve the general usefulness of edit summaries.

This would be potentially quite a big change to the way MediaWiki works, but, I suggest, overall a positive one.