Because all high impact auto rifles are far to stable with to much impact, they wouldn't kick up like SMG type auto rifles but they would kick diagonally sharply. On top of that the headshot hotbox in this game is pretty ridiculous. The MIDA multi tool takes 4 head shots or 3 head shots and a body shot. The Suros takes 6 head shots (much higher RoF than the MIDA) and does incredibly high body shot damage (at 30) so it's not hard at all to use. I know I can't go straight up against them without using my fusion rifle, or long range scout rifles.