I don't think I have used either one of them so I may not be the primary
target audience either way.
I only remember having used telnet in the 1990s to connect to oldschool
text MUDs.:D But I guess for ruby in general there is very little net
benefit; and since they are available as gems, I suppose it makes sense
to remove them from the core distribution, and offer them as gems to
those who need them (after all that has been one motivation for
gemifying ruby core releases, so the proposal makes sense to me).