And how would you suggest that works when people can get around it easily?
Also that would cause way to many issues.
While it doesn't happen often, I occasionally see posts by users with tons of posts, joined 10 years ago, and I've never seen their name before. No way to easily see that the poster used to post under a different name... unless that is sometimes the point?
The name on all the old posts changes to the new name. Sometimes, you can find the name change request in PFI. Like Olds said, the mods track changes, but user's don't have a 'easy as pie' way to see change history. to be fair though, there are VERY few name changes.
Would be nice to know as I had no idea that Lean L was iamanidiot. Or that Skoorb is still among us but with a changed name. Makes you wonder who is who sometimes.