> they tend to follow brownian motion in 3D

Well, their entire neural system exists to make deviations from Brownian motion. That's the whole point of being an animal not a plant. And doing it well is very very subtle.

First steps towards modelling such behavior can be super-interesting science, not a terrible use of time at all. They can capture a lot of truth about how it works. But like self-driving cars, the thing that kills you is usually a weird edge case, not the basic thing.