Most important part of the linked article: "The bar for notability or even remembrance is simply much lower for recent history."
Additionally, I'm pretty sure that poetry in Ancient Greece was if anything more commonplace than it is today, and not necessarily some high action of the literati. I think we're used to a world where the marginal cost of reproducing creative works is very low, so everyone can hear the same songs and read the same books as everyone else - before the era of easy reproduction, I think you had a lot more "local talent" generating their own little poems, songs, plays, etc.