And, again, if you don't have the emotional regulation to not fly off the handle at things that aren't actually dangerous or threatening, that's a you problem not a problem with the existence of your limbic system.
To be explicit: had I acted out of anger, I might've tried to fight the guy, and (especially if he had had friends), it would not have ended well. Having instead used my neocortex: his initial advantage lay in choosing the time, manner, and place; time there was nothing to be done about; manner I negated by switching first to grappling, then to grappling in a situation where I had the cardiovascular advantage; and place I negated by moving to a location where there were other people.
(in retrospect, if I'd just not tried to shortcut through an alleyway at night in a strange city, I would never even have had to make use of my normal cardiovascular capacity)
When was the last time you faced a threat of violence for which increased cardiovascular performance improved the outcome?
(b) That an adrenaline dump provokes a significant boost in cardiovascular performance is true. We are neither fighting anachronistic saber-toothed tigers, nor are we in the wild west, we are in civilised countries in the 21st century. When should improved cardiovascular performance improve any outcomes?