Like most DB players I rarely if ever aim down sight, as for the most point there is no advantage to doing it over hip firing.
It may just be me (and feel free to say so) but I’d like there to be a reduction in weapon shake/bloom/climb what have you to make ADS useful in specific situations.
I would think you’d be bracing more and of course not moving quickly so it would give you some advantage on accuracy. If there is a bonus it must be pretty small as never feels like it’s worth it.