as much as we train pilots to ‘mask’ illusionary effects by focussing on the instruments, we cannot guarantee success in every situation; not for every pilot, not now nor future.
The point is although the g forces, sensations are same for both pilots the PM was not affected by them and was guiding the PF correctly. Despite clear cut guidance by PM to maintain the pitch PF wasn't able to do it. Should there be some guideline as to how much deviation the other crew member should accept before physical intervention otherwise we learn nothing from these loss of lives. Also
Thinking about your point “where the pilot was overwhelmed and mentally incapacitated”, this could be related to an effect of surprise. In taking a decision and executing a go around which is a well practiced manoeuvre where is the surprise?