So when Cata came out, we finally got a mount that works underwater.
looks badass, finally we can move fast underwater.
But then there's a limitation, which in my opinion makes this mount useless.
" Can only be used in Vashj'ir ".
Now during MOP, there's no reason to go to Vashj'ir.
Heck, even during Cata, I doubt anyone went there again after finishing the quest-line.
So we got to use this mount for such a short time, which is a shame.
And for all the people who are going to say:
" DERP, You can always get/buy Poseidus and you'll be available to use it any time you want "
last time I checked, they go for almost 100k and it has a LONG Re-spawn timer.
So why not just make the Seahorse usable everywhere, and make a RARE underwater that is "special" ?
Just like Time-Lost Proto Drake or Phosphorescent Stone Drake...