All I can really say to that is it sounds great for a medieval sim. But that sort of medieval sim seems like a completely different game from CK3? That level of economic detail has never been a focus of CK2 heck its economic detail is incredibly limited. There aren't even trade goods.
This sort of thing you want, while cool, fits in more with... Vic2? And as much as I do think it's a masterpiece of a game, it looks boring. But everyone has their own tastes.
Unless all you want different POP types to be responsible for is... just tax? In which case it seems rather overkill for the purpose at least to me.
Going by the 4 pillars of vision that they have: Character Focus, Player Freedom and Progression, Player Stories, Approachability
The thing you describe falls into none of those. While all the features they've shown off seem to feed directly into that.
Honestly a strong vision and focus for the game is great, I:R has had a critical lack of it. And hey it has POPs. I'm not sure what they add to the game though as due to having so little detail and little time put into them they are... kind of pointless.