Pet pathing / going through walls + immuned to some cc

I am really wondering now how this pet pathing problem we've had on Frostwolf since forever had not been fixed yet. I mean, dev team made it work good on Lordaeron and i really don't get what's so much harder in doing that on MoP. Here, hunters just send their pets and they'll go straight to their target going through walls and are impossible to CC except stunning (they'll attack you even if you poly/fear them for exemple)

How can you make stampede usable when you can't do half of what you're supposed to be able to do against it?

ye, pet's walking through pillars in Arena is pretty breakgaming/annoying

and warriors charging from the ground on the bridge...

This works on retail too though (war charge), given the right angle. You can find many videos of players doing it.