Yep, the levels are distributed oddly. I’m currently upgrading to citadel 8, and I can easily attack level 5 citadels now. And most level 8 dudes with better upgrades can’t touch me.
Furthermore, this creates a reverse-improvement drive. It’s better to keep swordsmen at level 1 as you can use voguls instead. And on a second thought, it’s best to leave voguls at level 1 too and just level up airships. Same with heroes. If I upgrade my Isunda or Locke it’ll mean that higher level people can attack me. Maybe I just focus on 1 hero after all to keep level low enough. And why bother leveling up resource buildings? Airships ignore them so the hit points don’t really matter, and lets face it, resources from producers stopped mattering around citadel 4-5.
Upgrading stuff should not be a negative thing. The citadel level limitation on attacks was good, please bring it back. (And this is from somebody with agressively leveled citadel/tg/hoh with poor defs).