Sounding better has very little to do with sampling rate. Higher bit rates offer a better signal to noise ratio, which as to be backed up by the design of the equipment.
And in the case of an engine size, an increased volumetric capacity does not mean more power. The Chevy engine blocks of years gone by were monsters. Things like the 5.7L engine needed a big engine bay. But you can get all that power in a modern day engine of far less than that. Technology has moved on.