Hm...
CONS:
-Could be a lie
-No filling (Ice cream cake does not count)
-Less flavors than pie
-Is not a number
-Cannot be thrown at someone's face and be funny
For one, cake
can have a filling. I have even tried one (chocolate cake with caramel-chocolate liquid filling ;D)
It can have many if not the same amount of flavors as cake... All you have to do is change the recipe in he batter, use a filling, or a type of icing!
And lastly, sure cake can be used a a projectile >
Here is your faceplam that you wanted! -facepalm-