@vmxa
You only focused on the KT when taking multiple cities, yes Chivalry is optional but for the SOZ you get that as
soon as you get mathematics and are lucky enough to have ivory. Something built in ancient times can make you OP
and it's easy to rely on because not to many civs have Ivory. It is a actually rare and in the Map I downloaded
based off the real world it's the Zulu/Carthage some African civ that gets it and the ancient cavalry have a
great mobility. I have seen them kill musketmen before which is why when somebody builds it I am forced to
destroy the civ As soon as possible to prevent them accumulating an army of Ancient cavalry.
It's overpowered. KT Is still a threat if left unchecked.
If I can build the KT, the level is too easy and I can do anything I want. Not sure what you mean by "multiple
cities". I am taking all the cities as I mostly play conquest. If you mean 4 or more towns in a turn, that
signals an easy game, at the start of the Middle Age.
I do not ever recall using Crusaders to wage a serious war. They are too slow. Too slow to move and too slow to
accumulate. I can't wait 40 turns at that stage to get 8 units. Units that will move one tile a turn.
I did not speak to the SoZ, so not sure why you brought that up. It is a special wonder that as you noted, requires Ivory. So you mostly do not have that and often, if you do have it, it is not availble at the time of Math. If it is available, then I am going to build it, if the level allows it. As I mostly play AWE or Sid, it is not easy to get. AWE I can get, at Sid I do not have a shot. I won't have math nearly in time.
I would not say to not build wonders in the AA, only that it should not be done in a knee jerk fashion. That is to say, I have the tech, so lets build it. That is what you see in weak game, same for all structures. It needs to use useful and cost effective or a critical build. Not just I have the item in my list, so lets build it.
AC's can break a game at levels like monarch or lower. Well lower than monarch just starting the game breaks the game for the human.
Custom maps should not be used in discussion, unless it is explicitedly stated tha they are custom maps. Same for mods as they distort the game. Not saying they should not be played, I cannot address plays in a mod or a custom and overlay it upon standard maps. Things will not be normal.
Normal games, Ivory can be any part of the world and you are unlikely to have it. So using a strategy that incorporates AC, is not a good plan. It is a great plan, if you are on a map that you know you start with Ivory.
Unless it is a civ that is next to me and at least DG, I am not concern that someone has AC units. I don't like, if they are next to me, but I can deal with it. If it is Sid I am probably toast, unless I can make them my friend for a long time.
I will say you are going to take big losses, if you plan on attacking muskets with AC. That is not a profitable way to wage war for any length of time. IOW one or two towns, fine. I do not like to attack muskets in town, with knights.
The point about optional techs, is that you can skip some of them all the time and others much of the time. A few, cannot be skipped. The reason you want to skip techs is that you need to get to better techs and ideally to the next age asap.
It is nearly 2am here, so I hope I was some what coherent and clear. My point in responding to your post is not to change your position on wonders. It is to alert readers that what you are saying is subject to many objections.