Jeff King [off-list ref] writes:
It doesn't get rid of the "you don't exist" message, and I think just
dying there makes sense. But that is actually the one that I consider
the most likely to happen in practice, and should probably have a more
useful error message.
Yeah, I do not think anybody minds losing that phrasing from that message
(the "parents" and "sysadmin" were the humorous ones), and we certainly
can phrase it differently, e.g.
Your system didn't tell me your real name; hint: git help config
and look for user.name
or something.