To summarize kettlefish's fine example:
First Edition: Each City is resolved individually. Each City provides only one 4 point score to the player with majority of Farmers supplying the City.
Second Edition: Each Farm is resolved individually. Each City provides a 3 point score to the player with majority in Each Farm supplying it, but any one player may only score any City just once no matter how many of his Farms supply it.
Third Edition: Each Farm is resolved individually. Each City provides a 3 point score to the player with majority in Each Farm supplying it, with no limitiation as to how many times a player may score a single city.
It's the Third Edition that really blew up Farm scoring because any City could yeild multiple 3 point scores to the same player. In my opinion, it fundamentally changed game play, and not for the better. I can understand whaleyland's friend being adamant. I wish there was a way for us to collectively be adamant
(and I'm not even addressing my thoughts on the two-tile city.)