Listen up, because there’s more to this than will fit on a bumper sticker and short attention span mentality will likely get distracted by something shiney before getting through it.
Tanks, Warlocks and players with “Resounding Protection” have passive daze/dismount protection.
We don’t have to take the long way around mobs to avoid accidentally getting hit. WE DON’T CARE. We charge right through and keep going until they reset.
But whatever water walking buff we had, on striders(now) or mount equipment(in the future)… will have been dispelled.
We will HAVE TO REMOUNT to cross water, regardless.
[Summon Random Favorite Mount] is smart. It will choose a water strider if you’re standing in water or swimming at the surface. If I sink in water, no problem, hit that mount button, jump and GO!
But that ends in 8.2. Mount speed is hella-important and unlike the other mount eqiupment, THERE IS NO CONSUMABLE alternate version of it. DK/Pally already have a move bonus, and get little or nothing from speed mount equipment. EVERYONE ELSE will want speed over all other options.
So, now instead of having 2 mounts that walk on water… I’ll have none and lose bag space so I can carry those annoying water walking potions around. Or, I bind another hot key for the angler’s raft and get all my alts trained in MoP fishing(1) so they can use it.
If Blizzard exempted the water striders from the effect of mount equipment, they wouldn’t have the 20% move bonus and your imaginary 10,000 to 1 people that “always use striders instead of all other mounts combined” would quickly switch to using them only for water crossing.
This isn’t a real problem that needs fixing.
And even if it were, exempting water striders from mount equipment and letting them keep their ability would fix THAT non-problem very well.
There’s no need to take it further than that.