Fixed point math is an interesting optimization for games, and it also has the
feature of determinism, something that floating point implementations lack due
to rounding, truncation, and hardware differences.
With determinism, a networked physics simulation can guarantee that every
machine can perform the same action, and given the exact same starting
conditions, produce the same result. This reduces the network overhead
significantly, instead of being forced to check the same result was achieved
across all computers participating, one can instead make sure that each action
was completed in the correct order instead.