Sights are incredibly important in CQB, as well as instinctive shooting, for accurate single shots outside of 25 feet.
Outdoors, single shots are important as well, but many games require suppression, and suppression requires volume. When shooting in volume, I often find myself aiming down the sights while tracking the line with the opposite eye.
Just about the only time I don't use the sights as intended, is with the m249... I find the irons are way off and it's easier to just shoulder the weapon and spray liberally...
Ár skal rísa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.