Well then hunts have special rules cause I've done it and seen it done countless times. And if that's the case, and what he's saying is only right in anything else in the open world, who really cares?
Sadly it's true, have tried to save dying players with provoke to no avail. However with hunts there's a nasty little trick to it. If you have 3 it more tanks, what you do is go all Emnity mode (Shied Oath/Defiance). First tank runs in, hits Flash for a huge Emnity boost, next tank hits Provoke to put him at that +1, hits Flash to double it, third tank hits Provoke to go to the new level +1, Flash... Provoke... Call it "Emnity Leap Frog". You can build up a -lot- of Emnity for your party really, really quickly this way.
This reminds me of so many conversations with my boss. What you are basically saying is: "I had this conversation you weren't a part of, and I'm going to assume that you know everything about it even though I don't." Blank stare plus two questions he doesn't have the answer to normally ends the conversation.