>>715918502There is no gap when everyone trying to win is using the perk that closes the gap, because the perk is so good it has no competition. You are creating these fantasy scenarios in your mind where someone using a tar with cold-blooded was just as competitive as someone using the scar with stopping power, even though the tar had a faster firerate they were still outclassed, virtually every tar user was going to use stopping power anyway. Mw2's secondaries were overpowered and not really what we're talking about here. The assault rifles were balanced fine and would have still been fine if stopping power wasn't in the game. The only good smg was the ump45, the vector/p90/uzi were extremely mid compared not just to the ump but the assault rifles too, and the mp5k was bad in the same camp as the f2000. The other smgs with stopping power lost to the ump without stopping power, that's how much of a joke they were.
Again for later games the problem was not some perceived gap that could have been closed with a perk. Bo1 just had really bad weapon design. The famas was the same bullets to kill as any other rifle but much higher firerate, rapidfire was built into them with no downside. Adding stopping power wouldn't change that. The same with the ak74u - it fired a little slower but killed in one less bullet, so slapping rapidfire and maybe grip on it just made it better. It had the better recoil pattern, a 30 round mag which many higher firerate smgs lacked, and a faster reload time. The rest of the smgs were a total joke, stopping power wouldn't fix that.
Mw3 had great gun diversity and perk diversity. Every single smg was good and had some way to compete with the mp7 except the pm9. Assault rifles had the scar-l, mk14, type95, m16, g36c in addition to the acr. The m4a1, ak47, cm901, and fad were a little worse but all viable and not joke weapons. Mw3 also buffed the lmgs to make them viable - the l86 lsw was one of the best guns in the game.