AV backdooring- why is it tolerated?

[Sponza]

Wall jumping was removed around tbc/wotlk so basically it's blizzlike like it or not.

[NikeTheSword]

Devs have also commented that they intentionally let it be.
I don't see a problem in it, it can easily be shut down with 3-5 ranged classes.

With regards, another alliance player.