There have been a few cars that had ACC but allowed you to engage a conventional "blind" cruise control over the years.
Tesla has never done that, though - AP equipped cars are without any cruise control when they can't see enough for TACC, and presumably that means no cruise faster than TACC allows either.
Having two versions of cruise control in the same car, one which responds to traffic and one which doesn't invites confusion and an accident due to having the wrong one engaged...