The condition to disable the overlay for gunners introduces more problems (and inconsistencies for that matter) than it was worth. Vehicle gunners using camera based weapons should probably consider not wearing a pair of glasses/goggles before doing so.
When aiming down sights, view is considered to be "gunner" and so the overlay would be disabled. Introduces addition canUseWeapon check if view is "gunner" to differentiate FFV seats from regular gunner seats