I will never fully understand gamers wanting to limit freedom of choice in the name of individual perceptions of immersion. I am able to imagine that someone who is a fan of the adapted original work - expects a certain consistency to preserve the internal logic of the world translated into another medium. But at the same time the game is designed in a way that allows you to interact with the systems to a degree you impose on yourself, according to nothing else, but your own preferences. At no point is the player forced to utilize the multiclassing system.