Account-wide Cloud Serpent Riding?

I don't understand why we need cloud serpent riding on each separate character if we already have the mount. It's one thing working to get the flying to ride the mounts in the first place, that's fine and all, but why is this not an account wide thing?

I mean, this kind of screws the people who worked hard on Glory of the Pandaria Raider AND getting exalted with the faction. The mount itself is account wide, but you can't ride it unless you have the flying? That doesn't really make sense.