User blog comment:TimmyQuivy/Introducing the UserRenameTool/@comment-1824169-20180209024203/@comment-25980608-20180209194859

There's another thing too that TimmyQuivy touched on. User names on Wikia are unique. On Facebook, there's dozens of people calling themselves Miley Spears. There's probably hundreds of John Smiths. On Wikia, there's only one Miley Spears, me. And there can only be one.

A lot of us like it that way. Some people might do user name of the day, and use up dozens or even hundreds of user names then nobody else could use. That wouldn't be fair.