I'd argue that the confusion is on the other foot. A lot of the complaints leveled against the AR/SMG seem to be working on the assumption that their role in the sandbox is supposed to be identical to previous games. The sandbox has changed. Before, the AR was strictly a fallback weapon that you carried around if you ever ran out of ammo, or more likely, you ditched for a specialty gun. The BR was strong at all ranges. Now it's:
AR: Strong up close, workable at mid, useful only for descoping at long range.
Pistol: (Very) strong mid, workable up close, only good for descoping at long range.
BR: Workable at all 3 ranges.
DMR: Weak up close, workable at mid, strong at long range.
SMG: Monstrous up close, workable midrange ambush weapon.
It's different now, because everything actually has a place. If you want to argue that players should spawn with a BR and an AR, fine, but the existing weapon balance is a good one, even if it is different than past games.