There are several reasons why I say we need to be able to test out the second chapter.
Since currently the idea of the balance is overwhelmingly based in the early game... which is very much not representative of the entire game.
Which currently stumps a LOT of the conversations. Ignoring that some people don't know how to play the game and consider anything they use badly as "bad" (See ANY conversation on Necromancy and watch as people bemoan how "bad" two of the most powerful spells in the game are)... There are quite a few aspects we don't know about that are important for knowing the game's real balance.
