I agree that 1on1 the pet is incredibly OP (Just check all the boss fights in the video to see that), however, on trash I can't just afk and let the pet do everything. I have to actively rotate Fury ward and use CDs and the pet can only have aggro on so many adds at a time. A lot of damage eventually gets through the pet and/or is directly dealt to me. I realise it's nothing near the same as proper tanks, but I do have to rotate mitigation/absorbtion skills.