Well, before the thread become too long for anybody to read it...
- more complex military system, especially including:
- - meaningful terrain and climate/seasons -- invasion out of the blue over Alps or Carpathians should be painful, wars protracted into winter should be painful too; so far I simply ignore seasons in Paradox games
- - logistics -- maintaining a single stack sent somewhere overseas should be difficult and it should simply shrink; marching through half the Europe and whole Russia to intervene somewhere in Asia should also be a bad idea; AFAIR even Ottomans in the routine Central European campains could loose half of the army due to desertion, diseases etc. before it arrived from Constantinople to its destination; besides, it should also prevent bigger countries from bullying the smaller ones so easily
- - outcome of a battle should be somehow unpredictable, or rather dependent on multiple factors so that a small army should be able to prevail over numerically superior enemy that is for example badly led or in unfavourable terrain
- I greatly support some more options in time of peace -- some reforms to pass (maybe you'll need to convince the nobles to accept them), some factions to manage, some economy to build -- I think a dificulty of playing for example Poland should be much like that: huge amount of difficult to manage internal problems.
- I would also appreciate multi-ethnic provinces -- otherwise Central and Eastern Europe lacks its complexities and is simply a bullshit; a pop system would be great, but I guess unrealistic to implement; however personally I would gladly exchange flexible but not much detailed starting point for a few well researched starting points with also well researched pops; it would also solve the absurdness of instant convertion and the process could be greatly slowed down; even pecentages or splitting the population into rural (most resilient), urban and noble (most eager to adopt the culture of the court) would be better, otherwise Ukraine is catholic in 50 years and Balkans are muslim and it's rather easy to turn them respectively Polish/Lithuanian and Turkish
- I would really like monarchs as real people with parents, siblings and children and with personal traits like in CKII and some system of principalities or provinces and with local nobles that can rise to power; anyway politics by that time was fuelled very much by personal/dynastic interests
- I would also appreciate less typos in Central Europe -- Victoria II after so much time still has "Bialystock" and "Siedlice" -- it's pain to look at that
As a sidenote: I'm just reading Wilson's "Europe's Tragedy" abouth the Thirty Years War and for example it shows very well how complex was the internal situation of Austria before the war: with personal and dynastic ambitions, religious divisions (that were not so straightforward geographically), resistance of the nobles and so on. I wish I could see more of that in the game -- not just the behemoths that conquer everything around.