I think tank characters will continue to be sucky until either game implements this gimmick or jumps the gun and gives them 80% damage mitigation to compensate them receiving up to 5 targets worth of damage. For reference by the time Granblue (pic related) powercreep added this, a middling build oriented entirely to ATK could easily reach 20k HP, a more generalist one 45k, and an endgame one for hard content that actually requires survival +80k.