Absolutely not. Ask a Hungarian if he is a Slav and vice-versa. Ask a Romanian if he is a Slav and vice-versa. See what answer you get. Yes culture is complicated and touchy, but it is beautiful and diverse. Culture groups need to be represented in this game, not made up and blurred for the sake of gameplay. That is what AI is for. Alliances and friendships are not cultural ties. Pretty sure the Portuguese and the English can vouch for that.This would honestly be the best solution.
West Slavic and Carpathian are both weak groups, making them into a unified Central European group would help a lot.
The problem with the OP is that his notion is that Slovak is culturally closer to West Slavic.
However it fails to realize that in history slovaks were just as close to both really.
Not only that, in the modern day the 4 countries, Czechia, Slovakia, Hungary and Poland are still very culturally similar and they were in history as well.
There are cultural differences, obviously, but the differences are better explained by the distance between Dutch and North or South German than to be a completely different thing.
Furthermore, the Kingdoms were at times unified under a single monarch and they mostly used similar military means, such as Hussars.
So I think it's clear that they should just form a single group. This would also help a long way with a defensive barrier against the Ottomans in the early game.
The coolest thing about EU for me is how it got me into history. I have spent hundreds of hours reading encyclopedias, memoirs, historical books, and Wikipedia just because of this amazing game. If I never saw the different coloured basque group in Iberia in version 1.0.whatever I never would have learned about the Basque. It would have been some low value province I needed to form Spain. I miss that.
Sacrificing historical realism for gameplay in a historical sandbox game is not the answer. The game needs to start out at a date, and that date needs to be represented accurately. What you do after that is up to you because it is a historical sandbox. The keywords that need to remain are History and Sandbox.
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