The advantage of the amateur
The difference between professional writers and independent writers (I think), is that independent writers are more immersed in a life that is less writing-oriented. A professional novelist is writing full-time, but important essays are often written by people doing other things full-time (raising a child, building a company, working in an industry, etc.). Essay anthologies could be so powerful because they aggregate the well-articulated thoughts of normal people—who make their specialized problems universal—into a powerful literary medium that can be digested by the public. A good annual anthology, then, gives the culture a tight feedback loop where they can make sense of a complexifying culture. And given how the essay is about “questioning” and running down alternate modes of thinking; the mainstreaming of the essay is mainstreaming alternate modes of thinking and living. (This is very Adorno in spirit.)