This is true but you are able to finish the game with all classes. Compare it with PF:WotR where some classes become useless for Unfair difficulty. So first of all Larian should nerf Multiclassing! And make spells only available for Spellcaster not for all classes. Instead increasing HP and damage as well as AC of the enemies Larian could IMPROVE THE AI. I know this is mad but it would be the first Videogame since a long time increasing difficulty by improving the AI.