BHarry
The Eclectic Collector
I'd bet you are correct, but there are some posts that reference members previous posts without a direct link (I think @kronin323 posted about that a while ago, but I don't remember exactly where). Also, some users are not currently as active but have lots of older useful posts. If @BriP were to change his username, it would be tough to find all of the valuable older info if you didn't know he recently changed names.Wouldn't a username change apply retroactively to all past posts, like avatar changes do? In that case for searches you'd only need to know the current username.
I don't think these would be huge issues, I just use the search function for research quite a bit and was a little bored this morning