[RLK]

Also imagine the recoil and the muzzle blast on any of this stuff. Firing any of this would leave a 100 foot deep crater in the earth and wipe out anybody within 1,000 feet of the contraption.

[RLK]

The days of massed troop formations where such equipment would be used are long gone. Two napalm bombs fry everything above ground in an area the size of a football field.

[BillCompton]

Also imagine the recoil and the muzzle blast on any of this stuff. Firing any of this would leave a 100 foot deep crater in the earth and wipe out anybody within 1,000 feet of the contraption.

I don't think you're understanding the nature of this technology. There is no "muzzle blast." It doesn't use an explosion to propell the projectile. The high rate of fire quoted as examples gives you capabilities, not suggestions. Can you think of no situation where rapid fire would be desirable? Since it is all controlled with solid state electronics, you have many aiming and firing options. If an incoming supersonic missile is heading toward an aircraft carrier, might we not want to fire as fast as necessary to deal with the danger? The million rounds per minute stat is not a suggestion that it be fired for a minute, but in a tenth of a second, we might want to fire 1,500 rounds. I don't understand people pooh-poohing an idea they know nothing about.