There's a lot of this going on in this thread, isn't there? People who don't allow player knowledge imagine all these terrible consequences of allowing it...adversarial arms races, players Googling everything during the game, combats stripped of challenge and excitement, lots of extra DM work, plagues of locusts, fire and brimstone...and when the people who actually play this way say, "Uh...nope. Actually it works great. In fact, better than when we used to play the old way" there is basically zero acceptance that this could ever possibly be true.