What unforeseen consequences come from allowing corpses to count as creatures?

There have been quite a few questions about corpses and creatures, such as here where it is argued a dead creature is still a creature, here where the opposite is argued, and here where resurrecting an animated corpse is up in the air.

My question however, is if you allow spells, and other features, which target creatures to also target corpses (dead creatures), what are some possibly negative or game-ending/breaking effects that would occur from this houserule?