The only way competition can duplicate combat conditions is if someone was shooting back. The only problem with dismissing competitions is that it's the ultimate in practice. There is no better way to practice than to get into competition. The guns have to work, the ammo can't fail, and the shooter has to adapt to different scenarios that they don't have any control over.
For anyone who tries to practice on their own: Did you practice shooting from a "flat on your back" position lately? Shooting from barricades? Behind cars? Seated at a table? Shooting moving targets? Were you out there when it's 40 degrees with a 20 mile an hour wind gusts. 110 degrees? Weak hand? One handed?
Competition can't duplicate warfare. Competition is more practice and it allows you to grade your practice.