It seems like when ever I host diablo 3 and go into the Nephalem Rift and yet other people close the Nephalem Rift after the rift guardian is died. Yet Nephalem Rift has more levels to kill enimies after you kill the rift guardian. Can blizard fix it so only the host can open and close Nephalem Rift instead of these noobs close the Nephalem Rifts.
Closing the rift is the smart thing to do. Lets you farm blood shards and GR tokens faster. Doing the extra floors after you kill the guardian is the same as starting a new rift, except with no more guardian to kill.
Tell people that you don't want to close after the rift guardian. They'll either leave, or if not, you leave and make a new game. As everyone said, it's absolutely not worth it to continue after the RG is dead, but if you want to do so, try to find a group for it.
If I'm in a public game and anyone tells me they wanna do full clears I just leave, instantly. Your choice, but I don't waste my time going on after the RG. I guess there's two kinds of people.
What you tell the group is that you are FULL CLEARING. You pretty much on FULL CLEAR if you are already super fast or cow level keeps spawning. You pretty much always full clear cow level because at least every time it spawns for me there's a high pool of reflection and high gob rate