I don't complain about limitations - they're must be in the game. I'm just wondering why they don't have any benefits here. Is it accurate enough? I don't think so.
Well that bonuses should they have? Democracy does not bring any advantage compared to other regimes. People are mostly happy in all regimes. Democracy is here to bring freedom. Actually also in today's world we can see that sometimes democracies are not working as they should and that dictators are sometimes better for the country, if the country is used to that..
I mean there should not be a reason to have any bonuses. IF you want to switch, it is just an alternate option that the game gives you. But expect switching to something just because some bonuses?.. I mean you are playing with the regime that suits to your play-style, right? Fascist are here to conquer, Commitern to spread their communist power and democracies are here to stay strong and free.
Also remember that if you switch to democracy, you are more likely to ally with USA UK etc.. so it depends on what do you want to play in the game..
EDIT: And as I´ve read above, "democracies are more limited than dictatorships". Of course they are. Cause to make something happen in democracies is very hard thanks to the law, government, this and that. But if you have a dictator, you don't care. So yea, that is just a fact how does it work so no need to give them something they should not have.