Level 1 or 2 forts along the Franco-Belgian border wouldnt breake the game. However, giving France the option to build level 5 forts by 1940 would (it would be very easy to upgrade to level 5 if you start off at level 2 in 1936).
A possible solution: Make upgrading forts more expensive as the forts grow stronger. Upgrading a fort from level 2 to 3 should be more expensive than building a level one fort.For instance: level 0-1 costs 5 ICs. Upgrading from level 1 to 2 costs 7 ICs and so on.
Building a Maginot Line strong fort (level 10) should cost more than building 10 level one forts in ten provinces.
Well, by 1940 it should be somewhat possible. But they wouldn't have also the tanks, planes, etc...
I completely agree with your idea, that's what I want too, but only if better levels are worth somehow. See
here for a fortifications discussion.
I think the last 3 games they made and the numerous spin-offs and official mods would speak to veracity of it being more than assumption.
Let's hope they'll do better this time, because if not, I won't buy their game. *Remembering the 50+ german mot/mec divisions floundering in the Norvegian snow for months and years.... in so many games....*
Exactly. On paper, the war in the west should have turned into WWI again. The French prepared for it, but the Germans did everything in their power to not have that happen. Which is why they took a long-shot gamble with most of their motorised forces in the Ardennes. Well. History proved that German innovation in the use of combined arms and mobile warfare trumped a French plan for static conflict.
That's why we can have that Maginot line historically accurate without experiencing any easy swinging WWII. I get your point of view, and perfectly understand that most games for most people would be rather traditional, but that doesn't imply that the devs should distort history, nor the game shouldn't be a bit sandbox at the very least.
If you want to be sure that France won't win the war in most of cases, why not this, for example :
France has all the advantages that it should have (no nerf, no scripted defeat, keep in mind, I'm talking to the dev team too, that French customers would be many

)
BUT in the politics, you've a pretty impossible to budge general top of head quarters named Gamelin who causes a 10% malus on all French forces coordination factors, and a 5% defensiveness malus due to a fractured government (until you can clean it up) or something like that...