Why does the orientation matter if the end result is the same? My point is your suggestion is no better than OPs, so who cares which way the brick points?
US polarized plugs have the neutral pin physically bigger than the line pin. They don't need the third prong to make it one-way, that's only needed for conductive-cased items to have a ground connection.
Nope, the neutral prong is wider on polarized plugs. Nearly all two-prong plugs are polarized, it's just stuff like transformers or soldering irons that aren't.
So it doesn't cover the bottom port with it's mass.
> if the end result is the same?
It is not; the difference is, that you could connect another brick to the bottom port.