Caveman land implies human nature without needing to make an argument for it. It is so far in the past that there is limited evidence, and most people you encounter aren't anthropologists. So you can justify all your unexamined assumptions about present society with an appeal to the caveman land.
Ironically, all you need to craft a fantasy caveman land is an imagination. "Picture hunter gatherers, sitting around a campfire, carving rocks into Pokemon cards and trading them." What a great story! Anything is possible in caveman land.
Funny thing how bards/poets/musicians/storytellers are a fixture in every society that has figured out how to produce more calories than each individual personally needs to consume
unfortunately, precisely defining good writing is difficult, much like good coding. And as such, whether there is enough good writing, or "how much better good writing is to bad writing", or "what the effects of good writing are on the individual or society" are questions that we arent remotely prepared to answer. I imagine many people advocating for support for writers believe on some level both that good writing has very positive effects for the readers and society, and that there also isn't enough of it, or at least that its drowned out by perverse incentives and mountains of bad writing
This is, notably, the exact same argument we make for why tech firms should hire junior engineers. If one doesn't keep subsidising opportunities for the up-and-comers in every field, one quick runs out of experienced candidates.
Why could a society not have a role for bards as well as hunters, as their day job, as their purpose?
Or in modern times, replace "hunter" with "working class".