Just a thought... how important are exact hydrometer readings? Could you tell the difference in a beer with an original gravity reading of 1.048 that should have been 1.052? Is an error of 0.004 gravity points significant? Can $10 hydrometers be counted on to be accurate to 0.002 gravity points (the smallest graduation on most HB hydrometers)?
I know several brewers who brew by recipe only and never take specific gravity readings. Their beers taste just as good, time after time, as any I've tasted where the O.G. and T.G. are known. I kid them that their brewing is like driving a car without a speedometer.
I use the flask and scale method because I can and it's convenient. I work with lab equipment daily. More often I use it to calulate ethanol content.