James Gasik
We don't talk about Pun-Pun
It's like this. If I'm searching for a hidden enemy, I make a Perception check. If another character searches for a hidden enemy, they make a Perception check. The odds are better of finding the enemy because we are both rolling.There is interactive help though? So weird that you don't understand that having someone around does help in trying to look or find something.
But instead, we have this scenario where one character IS NOT SEARCHING, because they are not taking an action to actively search, and is instead improving the odds of another character making a successful roll. All the second character is doing is using their regular old passive Perception (which we have to assume isn't good enough to find the enemy) and instead of actively looking, is somehow guiding the other character to see something they could not see.
I mean, it's like if, during the Fellowship of the Ring, instead of Strider saying "Legolas, what do your Elven eye see?", he announces "Even though I cannot make out anything with my inferior human eyes, I'm going to look in the same direction to give Legolas advantage."
Because, in this scenario, what if the one person succeeds due to the advantage? Now they see the target, but the person who is helping them does not. What they are looking for is still as invisible to them as it was when they declared they were assisting!
It doesn't make logical sense to some people, so irregardless of the RAW, they wouldn't allow it. Which is a legitimate way to play the game, just as always going by the rules even when they make no sense is also legitimate.
*Just to reiterate, I'm slightly on the fence here. It doesn't make much sense to me either, personally, but I wouldn't stop my players from doing it, if they so chose. After all, they take just as much risk by taking point as the designated scout, and are actually in more danger, if their passive Perception is lower, by possibly being surprised by enemies, falling into a trap, and so on. In fact, in my current game, the Cleric has the best Perception in the party, thanks to his Sentinel Shield, but the party refuses to let him take point, instead keeping him safely protected in the back line.