Hello!
I think that the damage that catapults inflict on the citadel should be fixed.
At the moment, the damage from the catapults at the beginning is small, but it is growing at a fast pace, very much ahead of the growth of the health of the citadel. This leads to extremely unpleasant situations when a relatively quickly destroyed fortress does not provide a sufficient threat, because a pair of catapults cannot penetrate the shield of the citadel quickly enough (or do not have time to break through it, being destroyed by a group of warriors), or vice versa, later the same pair of catapults became too terrifying threat. Especially now not only the citadel, but also the keeps suffers from catapults.
I would be glad to see a change if the catapults inflicted fixed damage in% of the citadel’s maximum health. How much? I do not know that it is necessary to test, but I think about 6% will be enough.
Now about the damage of structures. It should grow over time. Yes, I understand that losing and destroying structures is normal. But in the late game, the structures do not provide sufficient threat to the opponents. If in the first third / half of the match part, the damage of structures is still capable of suspending opponents, then further growth in the total amount of health and healing allows you to ignore them in too many situations. Also, forts and keeps, in addition to the effects of slowing down and reducing the speed of attack, should be added the effect of reducing the speed of recovery of abilities (and add that effects to Core), and possibly a slight decrease in armor.
This also applies to monsters. In the late game, even completely intact fortifications on the line do not have enough effect. The health of the monsters in the late stage of the game suffers not enough from structures in comparison with the damage that the heroes inflict. I mean that mistakes in the late game should be expensive, but if you managed to keep the fortifications to the late game, they should mean more in terms of defense.