Idea slots and technology slots. I find this quite a curious thing, actually. Idea slots encourage players to personalise their nations, which is good, but it leads to a paradoxical situation: I want to focus on trade, so I pick diplomatic ideas that require diplomatic MP. Thus, to advance my ideas, I need diplomatic MP, and that means that I can't spend them on diplomatic technology. I'm not really playing a militaristic game though, so I have loads of military MP, and spend that on military technology. Thus I, as a trading nation, end up with poor trade technology - but better military technology than a country that does lots of fighting and has military ideas! This really does seem like a backwards situation to me, and I think that it's because EU4 has money/economics and MP the wrong way round, if you see what I mean.
This is completely true. I think technology should come back to being dependant on money. Or maybe a mix of both... I don't really know
Appart from that and some other small problems, the game is AWESOME!!! (just so you know)