Ffs... Why is respec topic always out there for all crpg out there. Not all games need or should have respec option. Games like this definitely not.
Story driven games like Pillars of Eternity is a role playing game, not a power gaming click fest.
You are going through the story through the character you have made. Role playing games reflect, to a degree, real world. And just like you are a sum of your life, is your character a sum of the experience he/she has gained over the story. You can't just unlearn everything and become something else and neither should your character in such a heavy story driven game. Having a respec in this game would be analogous to main character suddenly becoming something entirely different in a middle of a movie or a book that would completely interrupt the flow of the story.