I believe adding the ability to integrate provinces would be a great addition to the game. Doing so would make the province's morale rise faster, and get rid of the 25% resource gain due to it being a non-core province (and get rid of the lines over the province). Though it would also have some requirements, such as infrastructure and industrial complex being built in it on top of a large resource cost. I feel like it'd make the game a bit more realistic, and add a bit more strategy to the game where players would want to plan out their attacks to destroy the integrated provinces.
Thank you for reading.
Thank you for reading.