Battlefield 1 has about what, 90ish physics entities at any one time. Loads one level at a time, has low geometry density, almost no physics "clutter" objects, and no AI in MP
Destiny has to be able to stream between areas, has triple digit physics entities (players, AI, clutter objects, weapon projectiles), and also has AI that needs to make relatively smart decisions so the timeslice for the AI has to be big enough to support that
you really can't directly compare between any two games in particular on how or how not they got to a framerate