Once you get to ‘Regular’ status, you unlock the ability to rename & recategorise any topic, which could present some obvious risks if a malicious user got those permissions.
I think the goal of that permission is to have regulars be able to help maintain clean topics that make sense when needed. The edits would be available to see just as they are when the poster makes them. However, they should be done minimally if at all. I’m also not opposed to removing that permission, not that it’s up to me, lol.