I can make up a plausible sci-fi explanation for the need easily: the folded space might not look like our almost euclidean geometry. Maybe in folded space masses take volume proportional to the mass.
Could even envision it in some future film. E.g. when NCC-1701-N goes to warp in addition to the blur effect all the stars swell up.
Could even envision it in some future film. E.g. when NCC-1701-N goes to warp in addition to the blur effect all the stars swell up.