savageorange said:
.. Yeah, I'm with Munkelzahn. UID is typically supposed to be a persistent id, so that's definitely what people will do. Seems like you could either avoid a "paper trail" (by creating a new account), or keep your posts, comments + etc, but not both.

That requires that people actually have the UID before the name change occurred. Which is highly unlikely in a lot of cases, and especially when the stalking comes from google.
It's certainly not perfect but it's a lot better than before.