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Now that's the billion dollar question, isn't it.

But it's true.

So to preoccupy your mind with simulation hypothesis and inter-node bandwidth estimation for the cluster we’re on.

edit: wait, if the Vector4.magnitude == 1, are dense objects actually just fast/hot?

With constant magnitude vectors, you can eliminate one of the numbers out of the motion simulation for each particle. Huge optimisation indeed.

As the sibling comment alludes to, it's otherwise they wouldn't behave according to what we measure.

For a deeper "why", see Feynman[1].

edit: it's related to how spacetime with a finite speed of light is represented mathematically. There's some discussion here[2] which might shed some light.

[1]: https://fs.blog/richard-feynman-on-why-questions/

[2]: https://en.wikipedia.org/wiki/Imaginary_time#In_cosmology