That's my choice too ^^
Except for carnivorous mount, as they can't find their food without hunting freely.
As a survival fantasy game, mount are really important to the PC. Then, it's not absurd to consider that it has not to be only one stuff in the inventory of the PC, but a part of the cahracter that need to be real in his life... I don't see this as rolling for rolling. The purpose is quite clear, and is an immersive one, not just a rule to rule... I don't consider that being rollply rather than roleplay