A player playing a barbarian isn't expected to deadlift a boulder IRL to prove his character in game is strong.
Why should a player playing a warlock be required to make a persuasive argument IRL to get to prove his character in game is persuasive.
I mean I get a little narration makes the game more fun and diving into the social aspects are just as important as the combat. But We are playing a fantasy game to let people embody whatever fantasy they want and some people just might want to be a lot more charismatic
What did they do?