BG1 and 2 didn't have much of a tutorial eaither.
Those were in the times, when people were not too lazy to read and figure out things by themself.

I think the way pathfinder is doing it now is really cool, when you hover over the icons and they explain everything. I was curious to see, some info about my classes or subclasses in character creation or at level up, but I guess they add it later.