No dust!
And yeah you can, a lot of games work fine with the DS4 alone. But the Move controllers are much better for gun wielding games.
In Until Dawn for example, if you had a DS4, you move both hands at the same time. If you have Move controllers you can move them independently, like real arms, and shoot in opposite directions.
Also, I wrote a review for Robinson, if anyone was thinking about picking it up: https://psvr-reviews.com/2016/11/14/robinson-the-journey/