I think the Yalta Conference should have some borders fixed, like France getting back all its prewar territories and Ethiopia being liberated.
As much as I like the attention given to countries such as France, Spain, and Yugoslavia, it's rough watching the Allies and Comintern win WWII and then turn all of Europe into a horrendous mess of bordergore. In France, it's not uncommon to see France, puppeted Vichy France (also named France on the map), Occitania, and then Savoy directly annexed by either the United States or the Soviet Union.
In Spain, you often see liberated Galicia and Catalonia, and then the 3-4 factions of the Spanish Civil War are each released/puppeted by other countries, meaning that Spain is technically far more fractured and likely to erupt into conflict than it was in 1936. Bonus points if you see a "Spanish Spain" collaboration government existing because the AI is too stupid to core its own territory using the post-Spanish Civil War decisions.
In Yugoslavia, it's often to see Croatia independent from the rest of Yugoslavia, even if Yugoslavia was on the winning side of WWII (in real life they would certainly regain their former territory after the war). Often, Croatia separates Yugoslavia from the rest of its holdings in Slovenia, though the AI appears hardcoded to puppet Slovenia in Istria. Given the many new ways Yugoslavia can further balkanize in the upcoming patch, I am afraid of what the post-WWII map is going to look like for most playthroughs in the future...
I strongly dislike how the Yalta Conference railroads borders in Germany, which has screwed me over in the past, but there has got to be some sort of middle ground between the nonsensical postwar bordergore and screwing people out of peace deals.