>Implying training matters at all in the age of machine guns and flamethrowers, which were both hilariously easy to use
^^... because as everybody knows from action movies aiming doesn't matter with machine guns or automatic weapons in general...
Training is what matters most. The gun is secondary at best. A well trained soldier with a bolt action rifle will more often than not succeed vs an untrained militiaman with a machine gun.
The fact than a MG shoots faster just means more shots can miss in a shorter time. Wich is exactly what will happen without proper training.
Modern armies put more effort in picking and training their gunners than their rifleman. Why is that necessary if these are so easy to use?
A flamethrower is a extremly complicated to use, unwieldy and dangerous device. An untained person will most likely present a bigger danger to himself and his mates than the enemy. Its also heavy and bulky. Even carrying if around needs time to practice and getting used to.