From a Reddit post it seems like they're making the Byzantine game more challenging and imposing arbitrary penalties to counteract the exploits and strategies players have devised over the years.
I just can't play EU4 anymore. I started a Great Horde run, conquered a few provinces, waited too long to declare war on Crimea once their alliance with the Ottomans broke down, Genoa swept in and annexed all of them. Then waited too long to war on Genoa, who secured alliances with Austria and an ugly-looking Aragon. Also the ally jinx struck again. My buddies the Ottomans got completely devastated in two wars, first against Austria, then Poland-Lithuania, leaving them in heavy debt with a smallish standing army. (Also, did an update buff European army sizes? Austria, Hungary, Poland and Lithuania can each easily raise a standing army of 40k at the start of the game, which is double of what I remember. Also can't help but feel there is a European bias when it comes to army size. The Bahmanids, despite ruling over a larger and more populous area, only have a standing army of 20k, Morocco also 20k, Tlemcen 20k, Muscovy has a larger starting army than either Great Horde, Kazan, and Uzbek, despite occupying roughly the same area size).
Recently started a Kazan game. Captured a few provinces, then got blocked by alliances. So spent an hour twiddling my thumbs waiting for an alliance to break or an enemy ally to fall into debt but got mind-numbingly bored so dropped it.
Then got bored of the 1444 start date and started an Aq Qoyunlu game at a later date, when they control almost all of Persia. Like an ass, I again waited too long to declare war on Khorasan and they got an alliance with the Ottomans (who, being my rival this time, showed no signs of weakening). Ottomans allied every little state bordering me, so expansion ended up getting blocked again. Respite in the north when Shirvan got their alliance broken with Ottomans, I declared war, captured all their provinces bar one, because Astrakhan's ally decided to declare war as well. No worries, I thought I would take it from Astrakhan once their war was over. Except they peaced out without taking the province, and the Ottomans rushed to ally this worthless OPM (did I mention the Ottomans hate my guts?) So I declared war on Astrakhan, being only the avenue for expansion, when Ottomans declared war on me, and my two western allies Tunis and Yemen simply broke their alliance (despite the fact that Tunis was sitting on the far side of the front, and had enough soldiers to open up another front and take enough European provinces to mess with the warscore) (and I had supported Yemen in two stupid wars they initiated in Africa). Only poor Jaunpur sitting in India came to my aid. I could have made a stand against the Ottomans (because almost every other province in Iran is mountains) but I didn't have the energy so dropped it too.
Can't get into Civ6 because keeps crashing. Civ5 has staled for me, it's just a game of 'click next turn'. Civ4 is interesting, but UI is unfriendly for me.
Still haven't resumed my CK2 Caliphal run. It's a Random World game, so it's missing stuff like historical Great Works and historical characters. Tried to add them by copying stuff from data files and pasting to savegame file but I ended up breaking the game. I managed to do that sort of stuff at the first try when I was younger and stupider, but despite the wisening passage of time and having gained more knowledge of coding I just can't replicate it. And lack the energy to keep plugging at it.