Quote from Jyrome fedx
There are mods for more mobs. Any one can use them. Try Mo-creatures.
Cows give milk, leather and beef. These are all unique to cows. Unlike having two mobs that do the same thing.
First of all, how do you know that horses are even going to be added? It was just a picture of a horse, there aren't any snapshots with horses in them yet.
Second. Do you know that they will be ridable? No.
Third. If they are ridable, it is likely that they will be faster and more controllable than pigs, setting them apart.
Fourth. Why do you care anyway? If you prefer pigs use pigs, it's not like horses are something that a player is forced to use.
Heck, you could even change the texture of a horse to look more pigish.