I absolutely disagree with the point where u have to feed ur mount to not lose it. This seems like the worst idea of all especially when mounts would be something u buy from the cosmetics in-game shop. This feature will make the game even more grindy instead of focusing on the important features. Having mount related quests, and mount related abilities is ok, but losing ur mount really sounds like a bad bad idea.
I don't care that much about losing an mount if its really easy to keep him alive. Like, your mount only is going to die if you keep a week without feeding or something like that. And when you feed him, you immediatly get you mount back.