yea people that have been a long time allready have a garage full of cool stuff, a car ready to and a gun ready to fire.
Not only that but they have more skill too use them.
beginners need a lucky shot too beat a pro, thats allways the case 
I say let every1 just use their whole arsenal because this wil give new people a better because they can build up their own stuff and show it when they think its fun enough.
CoD doesnt get build from scratch every new release either.