Nothing really comes close to a Pdox game when it comes to deep, historically accurate nerdgasms. (well they come the closest at least)
Where its really lackluster is the combat. I know its by design, I hear you, but sometimes when we build up that force and technology to take a keep, theres a bunch of excitement leading up to a few seconds of two small icons banging swords.
When what I really want to do is lead my army in the thick of it. So if TaleWorlds were to gain license to make M&B fights launch during CK2, how much would you be willing to pay?
Combining two of my favorite things, I would pay a lot for.
How it could be done? Open battle api interraction from the CK2 dlls.
What Pdox would do is have it so that when a battle occurs that a player wants to interract in from an external application, CK2 checks to see if there is a process implementing their battle API. If there is, CK2 pauses and invokes the process that is implementing their battle api and passes all of the information about the battle to that external process, then CK2 just chills and waits for that other process to return the results of the battle, or for you to click cancel and do the fight automatically.
This would allow a studio like TaleWorlds to sell enhanced combat expansions for Pdox games. Or even creative assembly, and get total war style battles. I've done something similar to this but never with a video game, but the same principle applies, two processes talk to each other through an api, leaving the implementation of some service to be not important as long as it satisfies the interface requirements.
Anyways probably won't happen with CK2 or even the next big Pdox game thats in the works, whatever that might be, but IMO you guys should play around with this concept when you get the time Pdox devs. I spend a looooot of money on these kinds of games, I would definitely pay big for the ability to combine the parts of different games that I like.
You're even M&B's publisher! You should be able to arrange something like this from them.