In my opinion the accepted answer should permanently stick as only the original question submitter has the ability to accept.


No, the answer acceptance stays. Here's an example of a question from a deleted user with an accepted answer.

The author of that answer retained the earned reputation. (As a moderator I can see when the user account was deleted, so I checked reputation events on both that day and the day the answer was accepted. The deletion didn't affect the answerer's reputation.) Based on a suggestion from CrazyIvan in a comment, I checked the Community user and found the acceptance event there.

One exception: if the deleted account was ever involved in voting fraud, all votes are removed regardless of recipient (source).

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