I get what you mean, 0 A.D. can feel a bit flat in the long run because units don’t really evolve. The rank system looks cool, but it doesn’t change how the unit plays, so you don’t get that satisfying sense of progression you see in Age-style games where your army visibly grows stronger and more specialized. Adding a real upgrade path could make battles feel more dynamic and give players something to look forward to as the match develops. Still, the current system does keep things simple and historically grounded, so I guess it depends on which direction the devs want the game to grow.