I have worked with pro audio since my teenage years in the late 1990s. Since several decades before I was born, balanced lines have been used for microphones almost universally. Amateur radio seems to be a rare two-wire holdout. This seems strange as it would have clear benefits for radio. A relatively short 2-wire audio cable can pick up a lot of radio noise in certain locations. Substituting a balanced line eliminates this. Would the same not be true in radio? Additionally, a balanced line protects dynamic microphones from being damaged by ~48v phantom power. The only microphones I worry about with phantom power are ribbon mics. Has convention simply over-ridden practical innovation (if you want to call 70-year-old technology innovation), or is there some other solid technical reason?