Meh, sadly one of the most silly, ahistorical mechanics of EU3 made its way into EU4. I hope this time it will be possible to mod out.
In order to avoid misunderstanding: I loved the demo, I was a big fan of EU3, CK2 and Vic2 and yeah there are minor things I didn't like, but I'm sure that will not kill my enjoyment. I think in so many ways this will be improvement on EU3.