I don't know if you saw my post, but my Ts go over with me, usually, 5-10 minutes to make the ending be at a good stopping point so it's comfortable for both of us, and natural. It's when we are "done." And then I walk out like I would if we had stopped right on the dot of when my session was supposed to be over.
Since the T ends the session, I see no issue with this, esp. since my anxiety is very high and I need closure (even temporary), and abrupt endings make me anxious. I don't know what group someone wants to put me in, but I feel as though both T and I have our boundaries in place. I leave when we are done, period.