I don't think anyone here is saying MG Rambo'ing is realistic. On the contrary, only that limited ability to do so is possible, and was in all probability done when conditions required it.
What is being put forward here is that player movement be reduced while hip firing, and a second mouse click required to "deploy from hip", thereby "nerfing" all LMGs for CQC in a manner suitable to the game's current mechanics.
Besides, it's not like anyone here has a say in what TWI does, or doesn't do, or if they are even reading any of this or even care... Yoshiro made a comment last year, blah blah blah...