Its not just the(possible) fractal nature of the universes structure,it is that the composition of idividual portions varries, and those portions react differently to the forces bieng exerted on them. And then at the fine level, is it the same to accelerated by a gravitational force, as it is to be accelerated by a magnetic one, of course not. We have layers of complexity, and it is quite beyond any imagining or quantifying. Luckily our aproximations will get a sandwich made or soup,it might be better for pondering the universe, as it can be stired to make little swirly fractals.