David, yes there are some examples of good local radio among the mom and pop stations. But that's not the radio that reaches most of the population and it's not the radio to which most of the audience listens. What's available to most of the population is mostly corporate, syndicated - automated - voice tracked canned radio. Exceptions noted but the pattern is apparent.
And even in those mom and pop - good local radio stations nothing lasts forever. Mom and pop pass away, or retire or sell out to a corporate owner or decide to try going corporate and get in bed with some venture capital firm. Months later, good local radio has become a computer in a closet. I don't know how it is where you are, but back here the remaining mom and pop stations have completely or largely gone brokered.
And there's a fine line between corporate and mom and pop in cases like the Gillette, Wyoming cluster where "Small Market Guy" works which is owned by a consultant and broker back in Maryland.
But back to the original point: The burdens of regulation - including maintaining a public file - are the price license holders pay for otherwise free use of the spectrum. The file must be maintained whether anybody ever looks at it or not. If Julius shows up some day and wants to see it, no significant additional burden is imposed. Besides, corporate owners or any owner can always post the public file online and not be bothered further.
The main point is the FCC can not check each station closely. The public file, and the possibility that Julius might show up one day and want to see it, is one way to keep stations honest. But keeping stations honest, according to Raven, is "harassment."