> I cannot think of a logical reason to not provide that information.

Because it's to an extreme degree a landlord's market and thus none of them have any incentive to do more than the bare minimum?

Even if it was listed everyone would "stretch" things by including closets and the like. The only way it would work is if the city did the measurements and maintained a database...but then you'd have people bribing the inspectors. they already do it over fire code.

Renting an apartment should require at a minimum registration, inspection (fire code - window/egress, detectors, and ideally an extinguisher and fire blanket), proof of insurance, and some sort of bond per unit that the city holds onto and uses for emergency code compliance repairs.