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Early design choice. The ability for people to change their username was a new thing, and people were changing them a lot during the first several months, and that influenced the search as I wanted to make sure that searches were cut 'n' pasteable / bookmarkable... and wouldn't break when someone changed their name.
People change their name far less now, so probably could be revisited.
Velocio
@Dammit
Why does the search need authorId? It seems counterintuitive to require that the person finds the number from the name, then searches on that. A little like making you search for the IP address behind a domain name, if that makes sense.