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So, it's pretty clear that no big overhaul to the sieges is gonna happen. Okay, a pity, but that's how it is. But I have two suggestions for the next game that I think would improve the sieges. One is probably pretty big, the other (relatively) easy. Starting with the "easy" one:
Make all the maps three-sided, not one or two-sided. I know you can't do fully 4 sided maps since units no longer flee to the square/victory point but to the nearest map edge, so making fully "surroundable" sieges is out of the question. But please give us the next best thing. I know you can, because you made some three-sided maps for TWW2, even if the walls aren't all equal in length. Give that layout for every faction with cities and don't worry about people noticing the copypaste, because we already notice it.
Now the more Charlemagne intensive one: more options in the sieges themselves, with the units that are already in game. For this, I'll copy a post on Reddit that put it very well: "Siege maps do not play well with a ton of systems present in the game. Just look at the spell browser for example. Count the amount of spells that have the "cannot target: on walls" clause in them. Look at all the grounded, larger than man-sized units in the game. None of them can man or scale walls, they cannot man siege equipment, either battering rams of siege towers. Even the largest among them cannot bash down walls, in fact Mammoths, Giants, Trolls, Arachnarok Spiders, Vargulf, you name it cannot interact with walls in any capacity."
If you can't make all of them have some interaction in the sieges beyond battering down the gates then please, pretty please, give the spiders the ability to climb walls. They even have that ability in the lore IIRC.