Worst iteration of your spec (or class)

What are you talking about? Something from BfA or SL? I missed those expansions. x_x

EDIT:

Prot wasn’t using Spellpower 'til BC, and even then, it was only on the weapon. And you don’t need a taunt if you never lose threat. Forced tank swaps weren’t that common in vanilla, and if I remember correctly, a lot of raid bosses were taunt immune anyway.