So is war in general, Watchman. Less healthy things have been done like WWI where men advanced into a hail of bullets as opposed to a forest of spear tips.

IIRC accounts of Chaoronea by Diodorus talked about relatively high casualties on both sides during the fighting. The only way I could see that happening would be from a flanking attack or the hoplites managed to engage the front few rows of the phalanx. It wouldn't be too hard to imagine that the front ranks of hoplites did things like get low to the ground and angle their shields upwards to get under the pikes. Points have a bad tendency to get redirected against oblique surfaces. The problem arises when you get to the first man and you're fighting him HTH except you can't move around since their are pikes everywhere and that other guy is getting support pokes from a guy in the back. There's also an issue of piles of bodies forming up in the front of the phalanx making it harder for the hoplites to push through.