Just as there is a difference between games that last a century, like V3, and games that last six, like CK3. We have so much information on so many leaders from Victoria 3's time span, and yet we will no doubt miss out on some of the historical personalities that are most responsible for crafting our modern world, like Bismarck, Wilhelm II, Napoleon III, Lenin, Roosevelt, and more in exchange for getting interchangeable 3D models that lack any sort of unique design or personality. It was a bigger problem in V2, where we had nothing for our leader, but it's a shame that it won't be fixed here. As I wrote earlier, I'm very glad that this deficiency will likely be fixed by mods as is the case for many Paradox games.
As this post sounds very negative, I'd like to iterate that I think that the game still looks incredible, I'm only let down by this one part. Not a fatal error by any means.