Have you ever foughten a glass cannon caster with BDCR? You are forced to jump around like a maniac, so in order to counter it, I either need to A) Be able to jump around consistantly, B) equip a certain kind of sheild to counter that damage, or C) force myself into Faith for Great Magic Barrier.
Have you ever foughten a DWGR user (Silly question)? You have to time your strikes right with their ridiculous invincibility frames, or go into faith for TWoP, get some dung pies, or use other AoE spells.
Now, I'm not completely saying "Buff Tanks", because I'm also for adding Ethereal Weapons as an upgrade path that deal the same damage as a +15, receive no scaling, and act as the Ghosts do (Can't be blocked unless Cursed/Transient). But we Tanks NEED some major buffs with how the game works right now.