I haven't actually gotten to this specific area of savage content yet, but I will say that it sounds like a wonderful change to me...

I always felt like giving the players Vulnerability stacks for failing mechanics was a crutch used in place of creating actual meaningful/challenging mechanics/gameplay. ( IMO ) There's a huge difference between insane BS that creates a memory/dance system that punishes you for not playing exactly how they want you to - and then creating challenging mechanics that punish you accordingly while giving you an opportunity to recover/mix things up.