I think it's a bummer that players have all these cool mounts but can only use a few of them in the new areas. Some areas can only be accessed via flying and flying is much faster than not flying. Who doesn't want to fly?

So my suggestion is to make a winged barding that is equippable by all mounts (or have a quest that allows you to toggle winged barding on or off for mounts). This would both allow all of our mounts to fly and it wouldn't look as ridiculous for mounts like Adamantoise to fly because the mounts would have wings.