There may be some truth to this. I remember my very first shooting competition, at a local indoor range. It was simple, just seeing who could shoot the smallest 5 shot group on a paper target. We all started firing at once, andcompetition won't teach you how to gunfight. But it will make you better at working and thinking under stress,
I got so tensed up, my groups blew from the usual 2" out to about 8". It was a VERY educational experience. Then I understood how a cop can empty his gun at a bad guy
and miss.