Paradox's Europe Universalis:  Rome - Vae Victis. Rome Total War : mod Extended cultures V. Medieval TW II mod : Bello Mundi 1.0

0 A.D. use it's own homemade engine and I don't think that will change anytime soon. Also starting from scratch makes the project above like not that much work in comparison lol

Do you think they can start from scratch if they begin with a more modern engine?

I think the project below has a lot of support : But it's an herculean task, and I still have no idea how one would bring it to be implemented into the game. There will be a tone of work too for reviewing the proposed (sizable but not crazy neither) engine changes, unit balancing, testing, maybe even adding some animations to make it extra-cool... Also there is the valid concern that it would inevitably add a bit of extra load. I took an approach that's actually super cheap on performance to simulate the interactions but some extra checks to handle collisions while units move with inertia seems unavoidable; and they however, add up a bit of load. So it's difficult to tell if in the end, it would be considered worth it, or be blocking the whole idea.

I'm so excited to see this. Can more regions be added?