Or like the Euro/UK recepticals, have the face recessed so than nothing can come between the plug and the receptical face.
On the American 230V thing, as a good deal
of appliances (including the bi-pin bayonet lamp) are double insulated and apparently polarity agnostic, I don't see really any need to change to an earthed end 230V supply.
AS for the frequency, I don't see a lot
of appliances really caring, as they are either resistive, Universal motor, or SMPS,
and could otherwise be designed to work on either frequency, and either an end or center ground supply.
