I've had zero problems with this particular system and enjoy it personally.
It forces you to role play. If a vendor doesn't have a Skill Book you want upon leveling up, you can check many vendors and your Homestead. There are also numerous Skill Books to be found while you're actually playing the game.
There are casual friendly methods one could use to break this process like reloading after level up if a vendor doesn't have what you're looking for.
How does this have anything to do with role playing? I am playing a role of a warrior and I cannot use a skill until I locate a random vendor who happens to have a book I need? It would make some sense if there were trainers you had to visit. It would still be annoying but at least THAT would make sense.
So I level up and I go "My friends, please wait under yonder tree while I return to nearest town. Praytell who must I seeketh to find the charge boon I have been yearning for? Would that be thine fish monger or mayhaps the Shady character staying on the first floor of the tavern? "
"Fear not, when i return I will bring thee all cheese" .
OR
I can just allocate the points in my character sheet and keep questing?
This is more intuitive, fun, and allows me to keep playing my role and stay immersed.
