If I recall correctly, and I'm afraid I haven't any references with me, the shift of both the major manufacturers to the captain always deciding on
and carrying out the stop had nothing to do with decision making. Following a particular incident (with a DC-10 if memory serves) NTSB/NASA in conjunction with several airlines ran a series of sim trials where they found that F/O's - particularly inexperienced ones - rarely managed to stop the aircraft in anything like the scheduled distance, whereas most captains did.
They put this down to the general lack of experience of the F/O's. Note: not low flying hours, many had thousands of hours of driving around in serviceable aircraft, just they hadn't seen any real emergencies and were frozen with indecision for a critical second or two.
I don't know but this may relate to the addition of the two second response time to the certification requirements.
Interesting, of course, is that those F/O's are now the captains 25 years on and may still never have seen a real emergency.
