Reina
Arcane
Okay, I get it. But here's my problem: those modded games are good PRECISELY because they are mods, not base games. Proper MEIOU-like game is a wet dream of all history enthusiasts who are also veterans of Paradox GSGs - but only theirs. Imagine normal (but interested in GSGs) player having a go at MEIOU without first getting accustomed with EU4 systems with vanilla - even I can get a little overwhelmed by large mods like this, and I've been playing (mostly heavily modded) Paradox GSGs since I was ten.You act as though a good GSG doesn't exist. If Paradox took, for example, the Winter King mod from CK2 and added proper, solid mechanics to it instead of the scripts the modders are using for the lack of better tools, I'd praise Paradox to high heavens. Hell, if they took the fantasy mods like Elder Kings or Geheimnisnacht and implemented them with the full budget of Paradox studios, I'd happily pay a hundred dollars a pop. Because they're good, fun mods that are only ever held back by the base game. If they remade EU4 to be simulationist like MEIOU, I'd be ecstatic.
Same with Gehemnisnacht/Elder Kings/whatever total conversion mod you can name. I remember a few mods that f.e. ported mechanics from GOT mod into vanilla. They were shit, because those mechanics didn't fit without general systems that work only in GoT setting.
Many of those mods heavily rely on flavour (unique events/storylines/decisions), but here's the thing: making flavour is relatively easy BUT extremely labour-intensive. I know that firsthand because at some point I did dip in seriously modding various Paradox titles. It's possible for modders who have all the time in their world, but not Paradox. Their singular team counts what, 20 people? If we consider other needs (like, making the actual game work), that's not much, not enough to delegate folks to write tons of funky stuff.
In particular, I remember debate around release of EU3: Divine Wind. In that expansion, Japan ended up being divided between completely unhistorical factions, with largely bland, ahistorical events and decisions. As it turned out, they could only delegate 2 (IIRC) people to do the research AND writing (in just a few months!) for the entire thing, lest it would be financially unviable. Plus, modders have all their time in the world and unlimited developement span, while production studio has to say 'stop' at certain point. Sure, CK2 with Gehemnisnacht is tons of fun now, but was it fun when Gehemnisnacht was just ~year into development? I remember it was total mess of a mod for a long time, and large parts (like Skaven) had to be cut off by submods for it to even work.
So yes, I think what you want is unattainable, unless you seriously expect for Paradox to work pro publico bono.