I'm not sure whether an official mirror is a good idea - it's another
service that would need to be maintained, and it seems that among
Twisted core devs there's not a lot of interest or expertise in
maintaining it. If Git-using contributors can take care of things
themselves without adding any extra administrative load on Twisted's
volunteers, what use would an official Git mirror be?
The obvious answer is that having one mirror to point people at is
better than letting them wonder amongst a forest of dozens of mirrors.
On the other hand, maybe Git users prefer the latter scenario. A number
of people have asked for an official Git mirror, though. If no one
wants this anymore, then by all means let's forget about it.