Voted No.
I mostly use the special mount, but sometimes, I use the horse. So, if I have a special mount and feel like riding a horse, then I would have to sell my special mount and buy a horse.
I don't see a point in it. I can have 2 cars and can switch between the cars. Mondays I drive a BMW, on tuesday a mercedes or whatever. I see mounts in this way, like cars. I can own more then one, but only drive one at a time.
If we could have saddles (like we had back in sacred 1), that would be great.