A. I have cats that don't go anywhere special that the other cats don't go so that doesn't work unless I supervise. B. It's difficult to make sure they get the entire dose, again unless you supervise. And good luck getting a cat to finish food they've decided they are done with. C. I have cats that are picky enough to ignore any food that has a crushed pill in it. They can always tell. Yes even if I use smelly food. D. Not all medications can be safely crushed. Slowly dissolving in the stomach could be an important aspect of the delivery.