This is also not true - as if a precisely sized tube is needed to constrain electron flow, make the wire too large and electrons suddenly get confused. Minimum wire size is important only to keep DC resistance to an acceptable amount. Using a larger gauge has no benefit and also no drawbacks.
What? Higher gauge means thinner wire and will most definitely have more voltage drop. Any lower gauge than the minimum gauge necessary will keep the voltage drop low enough to keep the integrity of the signal.
-To be an audiophile you must abandon all research and science.