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WhosDaDungeonMaster
Guest
Honestly, I let players help and grant advantage on all sorts of things, and often enough they still fail or don't get as much success, like with persuasion, that they were hoping for. I have yet to see an instance where helping or working together is broken, but that is my experience I suppose. Also, out of my six players at present, only one has been a power-gamer/min-maxer who started a character with a +7 to a check or attack; others were high, mind you, but only one was maxed out at Level 1. So, part of this is also the people you play with and how you run your game IMO.