I didn't play CK2 so I generally stay away from that conversation but often I see people quoting the good it had in comparison to CK3 while rarely acknowledging what CK3 does better, and I just find it hard to believe that CK3 has achieved little or nothing in that regard.
At release and still now in some parts I see CK3 not as a step forward more like a step to the side, sure there are things CK3 does better like the religion reformation system(at the cost of other religious stuff being discarded like that pope voting system), some UI elements are better, characters models are a huge upgrade in my opinion. I am sure I am leaving out other small features that are improvements in some parts.
But there is so much content that is cut from CK3 that were in CK2.
Combat is overly simplified, no more flanks and such, no more fleets you need to raise and perhaps not having enough boats to ship your entire army in one go.
Council is cut down compared to CK2 conclave dlc which is a huge step back even with the feudal contract system we got now in CK3.
It took us one and a half year to get artifacts again now with Royal court, we still don't have societies to join and do fun stuff with.
There is really a huge lack of events and lack of choices in them that isn't hardwired to be bad ones.
We can't play republics as there is no true goverment type of it, nomads do not exist properly. all tribals play the same, clans are basic and the feudal system is the same across all of europe and india.
Diseases and outbreaks of diseases does not exist like it did with the reapers due dlc in ck2.
I am sure I am missing lots of other content from CK2 because its been a while since I last played it.
But I mean going onto the next game should be a step forward not a side step and make us buy all the same DLCs that we bought for the previous game. Content that is DLC for CK2 should've been incorporated into the base game of CK3 yet it was not and if it was it is in its most basic state.
And in my opinion its all just to make us spend money to pay for the same stuff that we paid for in the previous game. This is why you might see us old CK2 players being grumpy about CK3's current state