I agree with your main point, though with an asterisk.

I don't think concise is necessarily better than long, nor do I think long is better than concise. The thing is, humanity tends to go in cycles. Poems for Babylonians, long epics for the Greeks, back to poems for Shakespeare and Goethe, then the Russians brought back epics. Kind of a mix during the 20th century, but poetry seemed to slowly fade, and novels trended generally shorter. (All of this is very 30K foot-view; of course there were many exceptions in every era).

Philip Roth predicted the end of the era of the novel at some point, long (relatively) before AI [1]. He said that, similar to poetry in the early 20th century, humanity has evolved past the meaningfulness of the long-form novel.

This doesn't mean "the humanities is dead." It just means that we're entering another cycle where a different from of humanities needs to take over from what we've had in the past.

Anyone arguing that the death of the long-form novel is equivalent to the death of humanities is missing the fact that "humanities" is not a precisely-defined set of topics written in stone. Though it can seem like this is the case at any one point in time, humanities can, and must, exist in many forms that will invariably change as humanity's needs do likewise. That's why its prefix is "human".

[1] https://www.nytimes.com/2018/05/23/books/philip-roth-apprasi...