Saeviomagy
Adventurer
No, I don't think that you can actually make that point. The base assumption is that players know the details of their character sheet, and are allowed to freely confer with other players in a game.I think you should consider the reasoning behind why you want to give hitpoint knowledge to players though. Is it to prevent verisimilitude? Is it to make the game tactically easier? Is it to preserve a feeling of certainty?
Is that purpose actually helping the game? Are people having more fun because of it?
Then make sure that the system you use is actually serving it's purpose.
That said, the immediate benefits of allowing players to know hitpoint details are that communication is far easier and the game speed is quicker for it. I don't think that many people could argue that easy communication and quick play are bad things.