Interesting topic.
Good point on the "timer doesn't go off". That said, there's a lot of videos on correlation between performance shooting on "real work engagements". Not necessarily combat, but LEO engagements, "CQB" (purposely in quotes), etc.
I've never been in combat, so will leave it to experts like CMO. . .

This video focused a lot on mindset and emotional side of the comparison of the "misconception". "mental and psychological terror", where many folks are associating gun handling proficiency with that experience. Where many assume all are "gun guys", where many view guns as just another tool.
One point that I've noticed with my personal experience with firearms training, is that there are those that can do, but not necessarily teach. There is NOT a direct correlation with those that (at least say they are proficient) to teaching. Teaching, especially relating to a range of people being trained is a special talent/skill.
His value is survival, where he made a great point of diversifying other skills, especially medical.