And these three faults are what make it so that sedes are not more united; in fact, it is the reason why traditional Catholics in general are not more united.
Actually, the faults you describe are faults that have been a problem in the human race since...Adam.
The most evident reason why traditional Catholics in general are not more united is because
there is no uniting force at this time. In other words, the lack of unity seen among Catholics is, itself, a sign that there is no pope at the moment to unite Catholics.