It actually is, since a machine is more likely to keep an automatic weapon on-target than a human being is, just because of the shear strength required. If a machine is firing at me from over 600 yards away with a large-bore rifle, there's not a lot I can do about it as a human unless I have a rocket launcher of some kind. And then only if I'm very, very lucky.

Isn't a robot-mounted rifle automatic by definition?

doesn't matter if the robot is pulling the trigger - just like modern automatic gears are actually manual ones where a "robot" is the shifting.

streams of bullets are no longer necessary as accuracy goes up. why waste ammo on suppressive fire if you can simply headshot with high precision? spotting targets through visible and invisible spectrum plus audio? using large caliber rounds that penetrate brick walls, car doors, etc (7.62, 50cal, etc.). basically mount 2 barretts on a turret and wreak havoc.