This is a pointless argument Nobody ever makes the choice between progressive and interlaced video at the same line count and refresh rate because they are applicable to different situations You might as well say that 12 bits per pixel images reduce the bandwidth to half of 24 bits per pixel for a given resolution This may be true but it s not likely to be useful because the 12bpp image simply has half of the 24bpp images s information removed and so is appropriate for a different set of purposes talk