Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Beta Did combat diffuclty get upped a ton?

I just wondered how difficulty/balancing will affect the possibility of splitting the party in coop mode.
After all Larian made a big fuss about it during the Kickstarter and while I personally think that the possibilities there are probably anyway a bit limited for story reasons, it seems pretty difficult to balance - you need encounters that are challenging enough for two players together, yet not too dangerous that one player alone can't possibly win them.