Interesting idea and I'd certainly like some diversity because we've got 4 tanks with slashing type weapons and 1-2-3 combos, but yeah as others pointed out a cover tank would create situations where other players do not want to assume the tank role. They want to play the style they signed up for.

I think the next tank (if there is one) should probably be the last tank this game gets, and the most unique they could go would be DoM tank casting psychic barriers around self but still fighting at melee range. If it has to be DoW style then please no more slashing weapons lol, anything different. Blunt pulverising club or mace might be ok or some kind gun-greatshield, a two-handed large shield that can boom.