Why? Don't say it's because it's more realistic because a Lewis gun weighs about the same as an MG42 and it can ADS. Obviously there would have to be some increased recoil and reduced range but at least you wouldn't run into as many corner campers. To me this would balance out the lack of actual LMG's. The KE7, Bren, FG42, and the LS26 are all really just assault rifles. The Lewis gun is the only one that feel like an LMG.