With the weapon connected to a pneumatic tube, it gives you the feeling of the blast of the weapon. You actually feel the recoil. When we're training people who have never used firearms, it's difficult to explain felt-recoil. The first time they're on the range, they fire and there's a loud boom and their hand jumps. This prepares them.
Novices also have trouble understanding the concept of flinching.
Then they see the laser on the screen - going in a downward arc, below the target. You don't have to say a word to them. They analyze if themselves. They see what the system is telling them. Developing sound judgment is more difficult.