Both of my TKD instructors (one 4th degree and other 8th degree and both Koreans) told me "Americanized" TKD is taught differently than in Korea. It takes years of daily training (it's a lifestyle in Korea) to obtain black belt whereas they are handed out like candy in the USA. My uncle is a 4th degree TKD black belt and along with both of my instructors shared the "real life" versions of street fighting TKD which was more efficient and effective.
Both instructors incorporated use of firearms into weapons training as the 8th degree master said "Even a martial arts master cannot move faster than a bullet fired by a proficient shooter." And the 8th degree master in his 50s said time slows down the body and reaction time but he could still pull the trigger just as fast as when he was in his 20s.
Pursuing USPSA match shooting after my stint in the Army was a natural progression of "weapons training" of my martial arts studies (I liked TKD but fascinated by Akido, then MMA and now Gongkwon Yusul:
I agree with you. The discipline of self control and focus readily translates to mastering various shooting techniques.
When I got coached by some kind regional USPSA match shooters, they taught me the "zen" of match shooting. They liken it to getting a black belt in shooting where one masters various aspects of shooting so you "KNOW" that you can absolutely hit the POA when the trigger is pulled. Instead of "hoping" to shoot tight double taps on COM/A zones, they asked me to "make holes appears" anywhere on the target. I started using 1/2 sheets of copy paper as targets and then 1/4 sheets to practice my double taps. With deliberate practice, fast double tap headshot was very doable repeatedly.
And my defensive shooting instructor (USPSA RSO) who taught local PD/SD SWAT teams taught me the virtues of point shooting with pass criteria of 4"-6" groups at 7-15 yards with eyes blindfolded -
https://www.thehighroad.org/index.php?threads/point-shooting.814672/#post-10428857
I have taught many groups to shoot and currently teaching defensive shooting techniques to several co-workers and their family/friends and in 2-3 sessions, they are point shooting (eyes open) at full copy paper targets at 7-10 yards. Some of them never shot before and I started them out by shooting COM with their eyes closed. My methods have become unconventional as I have them shoot my Glock 22/23, M&P Shield 9 with only their thumb and middle finger to prove to them, it's proper technique and not brute strength that's needed to control their pistols. The instructions are less like my Army days and more like martial arts instruction of going over each technique and coach them to perfection.
Instead of separate draw, stance, grip and trigger control motions, now it is smooth one fast motion of draw to bang ... bang, even with eyes closed. Seeing them master the quick draw to bang bang at multiple targets is like watching a white belt successfully master the spinning roundhouse kick.