Yeah, I find ADS interferes not only with visibility (which might be by design) but also feedback clarity. In Destiny I often have to watch for numbers to pop up to make sure I killed something, as the combination of recoild and the gun model block visibility to the enemy after firing on them.
There are five Halo games demonstrating that not using ADS works very well in Halo games. Using ADS but removing movement and aim penalties seems like an attempted compromise with the CoD vs. Halo crowd; keep the movement options of the latter and the visual style of the former. A common critique of Halo 4 is that it attempted to chase the CoD crowd while still being a Halo game, while failing at both. It seems this is another crack at the same, though less egregious than say, global ordnance drops.