Sounds like the main issue is using paratroopers to capitulate France. The purpose of the "Around Maginot" and "Schlieffen Once More" is to make it easier for Germany to cause France to capitulate. it is a reasonable assumption to make that if Germany caused France to capitulate, it is because it has an established line of attack into the French interior, either by breaching the Maginot Line, going through Belgium and/or the Netherlands/Switzerland, or achieving naval superiority and pulling off a naval invasion. After France has capitulated, there is no need for the focuses helping you do one of those things, so it makes sense that they are now invalid.
The Franco-British Union, notably, only happens after France has capitulated. In the course of a conventional (read: non-cheesy) German invasion of France, there is very little chance that the combined French and British forces then retake Metropolitan France until either several years' buildup, Germany being distracted by other enemies (such as the Soviets) or the United States joining the war. Any of those options would also necessitate an increase in World Tension that should allow even a non-aligned Germany to fabricate the necessary claims to invade Belgium should the Allies somehow manage to retake France, rebuild the Maginot line and get themselves entrenched along it once again.
From the game's perspective, what happened is that you were so good as to be able to invade France and cause it to capitulate without needing to go through Belgium, while at the same time being bad enough to let the Allies quickly recapture everything you've gained. In the vast majority of cases, those two things are pretty much mutually exclusive. If you've successfully invaded France, you can probably hold it long enough to allow you to deal with Belgium by the time that becomes necessary without help from focuses. And if you don't have enough forces to hold Metropolitan France against an Allied counter-attack in 1939, you certainly didn't have enough forces to take it in the first place.
So ultimately, the root of the problem is that you were able to cause France to capitulate without actually having military superiority in the area. Which suggests that the conditions for the French surrender need to be revisited.
The Franco-British Union, notably, only happens after France has capitulated. In the course of a conventional (read: non-cheesy) German invasion of France, there is very little chance that the combined French and British forces then retake Metropolitan France until either several years' buildup, Germany being distracted by other enemies (such as the Soviets) or the United States joining the war. Any of those options would also necessitate an increase in World Tension that should allow even a non-aligned Germany to fabricate the necessary claims to invade Belgium should the Allies somehow manage to retake France, rebuild the Maginot line and get themselves entrenched along it once again.
From the game's perspective, what happened is that you were so good as to be able to invade France and cause it to capitulate without needing to go through Belgium, while at the same time being bad enough to let the Allies quickly recapture everything you've gained. In the vast majority of cases, those two things are pretty much mutually exclusive. If you've successfully invaded France, you can probably hold it long enough to allow you to deal with Belgium by the time that becomes necessary without help from focuses. And if you don't have enough forces to hold Metropolitan France against an Allied counter-attack in 1939, you certainly didn't have enough forces to take it in the first place.
So ultimately, the root of the problem is that you were able to cause France to capitulate without actually having military superiority in the area. Which suggests that the conditions for the French surrender need to be revisited.
