I don't know if this has been mentioned before, but I think it has. I'm certainly not the only one who finds it annoying. It's about riding. In other games, mounts swim. Slowly, but at least you don't have to dismount. That would be really great in ESO, too. Always having to ride around puddles, lakes or rivers that are too deep or dismounting/mounting is an extremely annoying speed brake in the game. Especially because you're always in combat, as the landscape is packed with aggressive enemies. When you accidentally dismount in the water you can't mount again because you're in combat. It would be awesome if you could change that.
It would greatly improve the riding experience in ESO and we could enjoy the beautiful landscapes so much more.