Well to me any extra movement affects accuracy, obviously not so much with you. I was trained in the Army in a dedicated Automatic Rifle course with a M14A1, a rifle that had the same 22" barrel, but a long muzzle brake which made the barrel appear longer, it had a Bipod, a wooden stock with a very heavy butt and a integral wooden pistol grip, the most forward part of the fore stock was a 'Bakelite' affair with a pulldown vertical grip. the bottom of that fore grip had a swivel and the sling went from the forward swivel thru the fore grip swivel back to the butt swivel and the shooter entwined his left arm in the sling with hand on the vertical fore grip. The shooter had to keep his body directly inline with the bore. Legs straight, the insides of the feet pressed flat on the ground, heels touching. if you superimposed a straight line starting at the muzzle following the bore line it should bisect the heels. You concentrated on several things at once, mainly keeping the rifle steady and your aim and your trigger control ('Fire a burst of three') (No mechanical burst control, all in the trigger finger) So while they only trained 2 or 3% of Infantrymen on the Automatic Rifle it was a qualification course and the test was hard. I forget how many magazine changes we had to do in the test but that was the hardest part for me. The test was timed, all rounds had to be fired and accuracy was scored. (Out to 700 meters, open sights, big targets)
Later I did fire full auto M-16's, and there may have been a Automatic Rifleman's course set up for that for a time, but few that I had seen had burst control as I was taught.
All that just to give you an idea of where my automatic rifle fire ideas were formed. Keeping that rifle steady was important then.
I do have a gimmick in some people's eyes and that is a TacCon trigger which pushes the trigger forward to reset automatically. You must still fire each individual round with a trigger press. Like a slide-fire or bump stock, it takes practice to be one with the technology, but my sights stay steady on target. No flyers. I could likely do as well with enhanced GI trigger, teaching my body to auto reset the trigger, but I'm getting old now and I just don't want to shoot as much and as often as that would take,
I was mad at the NRA just like you over the 'Bump Stock' issue, not because of owning one, but because the issue had already been addressed and settled by the ATF. Then in comes the NRA telling a Obama selected head of the ATF that it would be not just be okay, but NRA welcomed, if the ATF revisited the issue. I did not become a NRA member for that kind of backsliding. They are supposed to be guardians and champions of our second amendment rights. They did not do any 'emergency' polling of the membership, they just arrogantly pushed forward their own politically correct agenda. They are as bad as the "DC Swamp"