If you want to rely solely on gun skill, then run no perks and no attachments.
Running strictly attachments puts you at a disadvantage.
You are relying on gun skill and it doesn't put you at a disadvantage. You have the advantage in what matters most in COD, gun fights.
If you're running Ghost but the enemy team doesn't have a uav up or when they do your teammates shoot it down immediately how is that perk helping you? If you have on Flak Jacket but they're not using nades does it help you?
Most perks are situational and their effectiveness is not always guaranteed game to game. I guarantee you will get into gun fights every game though