B Mass of Space (B but approaching I)

[PeterDonis]

Quite often here in PF it comes to a point where someone explains expansion of the universe doesn't mean that space expands, it means increasing distances. This seems quite vague and with no reference to coordinate dependence. But it at least points to right direction. Would you agree to that?

Sort of. When you fill in the missing information about what "increasing distances" means, the coordinate dependence appears. So whether it "points in the right direction" depends on what your goal is.