Larian has said they'll probably add some sort of solo mode in for release, and you can use that.
Nobody is going to eat your steak. Hundreds of thousands of people will be playing this game. It might surprise you to learn that no, you are not in fact entitled to have the default game balance which everyone will use designed so that a solo player in this game (which has mechanics based around a 4-person party) can breeze through the game on Normal difficulty. The customer is not always right, even if you paid $60 USD - especially when there are so many customers with conflicting desires.
