I'd describe myself as a pretty big fan of the HoI series (and bear in mind I did not work here until a while after Semper Fi was released, so it's not a "because I worked on them" thing), but re-arranging the leaders of the German army every game quickly went from a cool detail to a chore to something that made me want to kill myself half way through it. Use auto-assign? It wouldn't make the same choices I would make, it would not be optimal, I have to do it manually! I don't think I am alone in that. While we could spend time making much better auto-assign AI with the end-goal of letting players ignore a feature (except even a super good AI would not know your thoughts and you would likely have to tweak it anyway), that seems like a waste of resources. Features that are not fun should be made fun or removed, not shuffled off to be automated. Now I'm sure for some, assigning leaders was a task that was enjoyed every time, and I am sorry those people are losing a feature they liked, but we need to make what we think is a fun game.
I have a better idea. How about you be replaced?
Simple truth: You cannot get rid of Major Generals because they were the lowest rank that could command a divisional sized unit.
Simple truth: Divisional sized battles occurred in real life all the time. See: North Africa. See: Amphibious assaults.
Also: WTF makes you think we want your definition of "fun"?
I regret to inform you this isn't Call of Duty. There is a certain type of person who likes these kinds of games and there are people who don't. The people who play this game are the same kinds who enjoy the depth of high-level chess. We are fine with depth and complexity.
There is a huge difference between an annoying feature, and an annoying implementation of that feature. What you are paid to do is solve is a user interface issue. Not to cut out content. Go work at Activision if you want to cut out content. Go work at Blizzard if you want to cut any content from previous successful renditions whatsoever. Seriously you belong at companies like those with your mentality.
I buy a Paradox game for complexity, not for a game I cannot even stand to play. I enjoy complex gameplay and mechanics, if I want simplicity there are plenty of other companies that do that. I could go play the Star Trek Armada 3 mod for Sins of a Solar Empire. Its much more "simple" and yet is still able to bring depth.
The issue really is that you have no understanding of what "fun" is for too many of your customers. Get out. I don't want you designing games from my favorite franchises and your mentality makes it obvious you belong in other genres and with other companies. Perhaps you should go play for the makers of WarGame? Same country I think. Also I think DICE would be perfect for someone of your preferences. I hear they are making a new StarWars BattleFront. Shooters is where you belong.
And if you are going to make "simple" game play then don't bank it off the success of a franchise. Hearts of Iron will sell many copies just because its Hearts of Iron. If you take your design ideas and try to start a brand new franchise (maybe in the Roman Era?) using the gameplay format from EU/HoI/CK there is a very high chance that it won't be popular. Your gameplay sells because of the work of others not your own talent. Dustin Browder at Blizzard is experiencing the same effect.
If you are actually so good as to know better than this many complaining customers then you would be able to at least match HoI2 sales on a brand new franchise using the same engine and basic gameplay format. I think you should be pulled from HoI4 and paradox gives you the opportunity to try. Then we can find out for certain whether your "ideas" and "concepts" are actually any good.
I've seen EU4 ruined for me, a very long time Paradox customer, by your exact mentality (and probably by you personally from the sounds of it) and I don't want my second favorite franchise of all time ruined by the same mentality.
Please stay away.