This a classic case of gamer indignation.
I'm sure the system will be fun. Instead of theory crafting in order to optimize your build, you'll be able to try out the builds whenever you want to find the best build for your play style. What can be wrong with that?
Also as a reflection on past gaming experience, permanent choices don't make a lot of sense. In order to try out new spells and abilities would require a second or third play through and I would rather have the best experience in a single playthrough.
The only consequences from choice with a permanent build are having a poorer experience. Making the choice for an ability that you have no experience with and which theory crafting doesn't really make sense, is not a fun game mechanic.







