The thing with Neo-Classicism though, generally in most parts of the world, it has a few great authors, then tends to drag for a long time, unable to evolve; it staggers, before being blown out in favor of often more radical, very new language.
I think that is apparent in French, when Romanticism essentially redefines a genre mastered over a century before its death. It happens again in England, but it also happens in, from what I understand, Chinese literature, as well as other traditions.
Generally neo-classicism, from my understanding, follows a movement that first commences as artistically brilliant - such as the rennaissance, and then somehow gets out of control, where the styllistic modes invented and developed become to decorated and fanciful. Then some people get it in their heads to "tie down" the language into "pure forms" - so you get strong writers for a while, with clean, precise, and sharp lines. This of course, gets boring quick. So Racine can develop, and French can be governed by the court of Louis XIV, or Charles II, but it doesn't develop -so by the time Voltaire comes by, the style becomes satirical - it folds upon itself, with similar shows in Swift.
The movements only managed to really move forward with, instead of a lasting refinement in style, a change in style to conventions of the exact opposite. Popular novels brought out the popular, often "trashy" forms as a counter to the limitations.
Also, Romantic poetry seems to have remade verse forms - the movement in the exact opposite direction of classicism and the 18th century in general.
This in turn becomes fanciful, and the cycle arguably respins itself in a circular point - with Romanticism being the head, then Victorianism the fanciful period, turned into Modernism, the re-defining of prose back into "purer" form, that is, "common spoken language" or Joyce's "Scrupulous meanness" or Hemmingway's "Iceberg." If we take it that way, Postmodernism is the downturn of fancy leading to the next big bang.
But that all of course is just wishful thinking. Only I find it interesting to note how neo-classical style can only stretch itself so far.
I think simplicity always runs the risk of getting boring very quickly; that's why artists coming away from it tend to obscure it. Movements that emphasize clarity and simplicity generally lead to movements of stagnation, and then about-faces.
As such, I don't know how to view someone like Swift, Defoe. or Fielding; somehow they seem dry and boring, as if they were just echoing a rather dry idea, despite the fact that in another context, they would be revered as the great stylists of their time.
Likewise, I find reading Dryden a bore, but in terms of style, he seems to have perfected the couplet form to an unmatched level; stylistically he is one of the greatest poets of English - how do we then understand that in today's context?
The whole of idea of simplicity and difficulty, of form and deviance from the form, gesture to a process of refinement, and redefinition outside of refinement. Joyce already wrote in the refined style that was the emergent force at the time; you see it in Dubliners, and in much of Portrait. But the form couldn't contain anymore, so, arguably, he sought to write the book of forms - Ulysses - in which he uses every single style of English he could think of in as many forms as he could work in. To me it reads like a Neo-Classical text more so than anything else - D. H. Lawrence would be his Romantic counterpart, as outlined by F. R. Leavis I believe.
So where does that leave this whole idea? ultimately, some degree of difficulty will emerge whether the tradition is of simplicity or difficulty. Neo-Classical writers had a knack for taking the simple, and writing the most ridiculous out of it. Marinism in Italy proves such an idea, where a penchant for gimmicks in stylized forms dominates even in a time when "classical refinement" and subject matter were thought essential.
I guess it is no surprise now that poets as well as prose-stylists are starting to push more toward the "comprehensible" - you see that in a lot of emergent authors. I wouldn't be surprised if the "simple" - the rehashing of Wordsworth and Coleridge's Lyrical Ballads introduction - is rerealized in the nearby future - as of now it looks like it's either that, or a descent into flowery, over-formed language, or else stagnation.

