Is it ethical to edit other people's bot/user pages?
For the most part, I think it's fine to edit almost anything on the wiki, particularly if your goal is to improve the wiki and make it more useful to more people. I've migrated/edited lots of such pages. Cigaret and Ascendant are both pages I migrated where I tried to preserve the author's text while also updating inaccurate info and reformatting for the new wiki.
There are a few things I'd consider rude though: