[schiffern]

>Seems like we’re going in circles here.

That's what I said...

>This is the case for everyday things like road traffic, restaurant lines, etc.

Bad analogy. The "fullness" of space behaves in a way that's precisely unlike those 'common sense' scenarios.

Collisions are the limiting factor in this domain. If you're not considering collisions, you're not accurately capturing the idea of "fullness."