Yes, I agree. Very special situations is the key. Just recently when vroom reduced the max length of user names, that was such a situation. However, I can't help but feel it would be fair to let people change their username in a limited way. If someone mistakenly chose a bad handle, and someday want to change it, they're pretty stuck. I know I change nicks on a whim and I'm not sure I'd like to be stuck with reptile forever. It's fine for now, but I've grown rather fond of 'gnulizard' (but that's going off topic).
It's a tough question. I suppose it would be possible to keep an aka list of users when they change, so on their home node it could list a few user names they'd had before. There would have to be some way of preventing people from changing their names constantly though. So I'll just concede and say I agree, no changing usernames unless due to exceptional circumstances.
local $_ = "0A72656B636148206C72655020726568746F6E41207473754A";
while(s/..$//) { print chr(hex($&)) }
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