Programmer Note:
I should mention regarding the 4/5 frame indivisibility speculation
Graphics Framerate (30 fps) and Physics Stepsize are not necessarily inherently linked.
It is possible to desynchronize game physics events and render updates, by linear interpolation (averaging) of event states before render.
Back in the days of PC gaming with CRT monitors (vsynch!), this sort of technique was much more ubiquitous.
Highly costly computationally, and much more difficult to program, so it wouldn't surprise me if given a FPS locked game Bungie has opted to take the easy way out.
Cannot definitely confirm either way.
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Which is why I said it was speculation :3 there's no real way for me to test 400 RPM if it doesn't exist in the game. It's a game theory lol I just find it incredibly unusual for them to make Focused Fire effect one specific archetype differently.