I know it's early access, but with just one region and huge amount of wealth, I can deal with the baron. So I try to setup other settlements on other regions for the sake of "internal trading" satisfaction. Guess what, I'm not satisfied.

Every region can sell some firewoods, buy sheeps, sell yarn, and buy anything they want afterwards.

Please make the time consuming and micromanaging multiple regions worth it.

For example, one region can have special units retinue maybe? Or one region can have disaster so that other region should give a hand?

I think it's not worth the hassle if we settle on multiple regions just to assemble retinues. Anything can be solved by firewood, sheeps, and clay.