Hm, man, all that sounds terrible. Short question: I didn't watch much anime (or anything) the last... decade or so. Anything to recommendate the last few years?
Well, i actually liked Frieren unlike some others. But super innovative and different it is not.
For example the whole Isekai - "i am now in a game or whatever" example: "Overlord", i think had a great core. The premise that you have "secret knowledge" and can apply your game tactics and your statistics, your unique perception and such while navigating a now political landscape as a "monster", while questioning what is real and what personhood means: Great idea. But we got big/small-boobed harem girls, asspull-powers, slow trodding plot, bullshit power fantasy. (I watched just a few episodes at the start, don't know what and if something changes)
So true. Most are just power fantasies and don't care much for world building or sensible plot. And the harems are annoying.
There are a couple that are closer to what you want (Ascendance of a bookworm, Grimgar of fantasy and ash, several others that only exist as light novel) but writing such is not exactly easy (Realist Hero fails horribly by trying to do political themes and just revealing that the author has no knowledge of it )
Eh, back to the question: Any recommendation for a good, short series/movie the last years which is without the usual shonen-anime shit tainting all the innovative crazy stuff?
Have you tried not doing Shonen ? While some Seinen are just more violent, others actually have more complex plots and themes. And there is Shoujo though that tends to have its own bundle of common themes (and tends to not be particualr complex) and , most important Josei which has a lot to offer in complex themes and stories and is most different from Shonen. But there are a lot of slice-of life shows in that category wgich you also don't seem to like ?
I want to watch something weird, inventive or thought-provoking again. Some nice meaningful action would be nice too.
Bookworm is a fun Isekai which takes its world seriously. But it has a bit slice of life flavor and not the hoghest animationbudget.
Eizoken is slightly weird and innovative. But it also has slice of life qualities and a lot of navel gazing
Ancient Magus Bride has weirdness and some inventiveness but has a somewhat questionable romance and the main character is a bit tropey.
Shadow House has also weirdness and while most ingredients are sommon, the show itself manages to feel a tad different.
But it is surprisingly hard to recommend stuff when i don't really know your taste all that well.