Definitely enjoying this game, but I do agree that the Realms RTS section needs some balancing. While the enemy defenses get stronger, our own don't, and it feels like all of the previous building we've done doesn't have any effect on our efforts.
Ways to upgrade our buildings would be great. A way to break through currently-unbreakable parts would also be great, or at least a way to purify a hex from a distance. Unfortunately, the bottlenecks and shielding does make the time-limit feel suddenly far too harsh once you hit the third level of Realms infiltrations.