That’s still a user problem and not a mount problem. Who cares how many people use the water strider? If the mount bothers someone enough, they should make the choice to take advantage of the option to use water walking on their other mounts and use one of those. If one really wants to min/max mounts, then deal with the strider and put something else on the other mounts.
Choices have consequences.
But, no, that wasn’t what I was thinking at all. Your assumption is wrong.
Blizzard could simply add more water walking mounts. Hell, I think the bug is ugly as all get out and would love another option. Blizzard could make the items function at the mount level instead of at the character level. Let me put water walking on the mount or mounts of my choice and something else on other mounts. Blizzard could make it so that the effect isn’t an item at all, but a trait linked to types of mounts. Maybe turtles and water striders and cranes have water walking but bears and wolves and cats are anti daze. I’m just pulling stuff out of thin air, but you get the gist.
I think that’s what bothers me most about the way they’re implementing it. They could implement a comparable system that actually provides more choices and more variety and more options in a way that actually adds content to the game, but instead they’re adding a system that takes away one option and adds a very limited other.