If I came across as condescending or strawmanning (I was responding to ASPGolan, though I admit I did it poorly) I apologize. I wasn't calling myself a casual gamer (or your side a hardcore one), but when all of us who attack this patch get labeled that way by some it can come across that way.
And we aren't complaining about the difficulty, we are complaining about how this patch has made dukes essentially useless, and event troops an Easy Button in some cases (I agree with the levy nerf but the rest of the game needs to be changed to account for it). That feels like an arbitrary way to make the game more difficult. Difficulty has to be done the right way.
Also, I thought the difficulty had zero impact on the AI? It says (for the lower ones) that its limited to a morale nerf and a fertility boost on your end. Just curious but is there a hidden impact on the AI/vassal behavior?
I have not fiddled with difficulty after moving from easy after my first game, but I do recall that harder difficulties increased the AI levy size. Might have been different for lesser difficulties, been a while since I looked.
Dukes are not useless, they are less useful in regards to troops if they are poorly skilled. For example a high stewardship duke with 3 counties provides more troops than a high martial with 1 county and 2 count vassals. So differing vassals with different skill sets if actually more important. Just because someone wants to cheese it out and use what most consider to be an exploit, doesn't mean they are worse either.
Event troops, primarily starting game troops might need a look, I done a quick Karen game and blitzed my neighbours, created a kingdom and was on my way to quickly forming persia with almost no real effort. I'd say 10 times easier than before, so there could be some work there to be done. Adventurers and rebellion troops, small chance of a larger than you can field forming, you really have to be a bad ruler or have some bad luck to get them. Since they scale with your size, I don't see the problem at all. If you don't manage your vassals and they rebel, there should be a chance this happens. Previous versions before factions and these stacks were introduced, were much harder to deal with. Non de jure, distance penalties and a revolt all factored into more revolts happening, which meant a rebellion would result in more if not dealt with quickly, or simply letting them win. With factions these stacks were made to help ensure faction rebellions worked, because at present the human can never actually lose one, unless really unlucky regardless of vulture spawn. If they make them more difficult than before I am for it.
Internal County Rebellions, somewhat larger than they were supposed to be I think, and we will likely see them become smaller. But I like their size now, because it means you must pay attention your counties and actually manage your realm.