Cognitive load may be the dominant form of stress but it is not the only one. I feel like this is very close to correct but subtlety and critically broken.
In particular, when the shit hits the fan, your max cognitive load tanks. Something people who grumble at the amount of foolproofing I prefer often only discover in a crisis. Because they’re used to looking at something the way they look at it while sipping their second coffee of the day. Not when the servers are down and customers are calling angry.
You’ll note that we only see how the control room at NASA functions in movies and TV when there’s a massive crisis going on, or intrigue. Because the rest of the time it’s so fucking boring nobody would watch it.