Fair enough. On the gripping hand, I generally make my initial decision on whether a class excites me based on a full read of the class features & early powers (at-wills and level 1 encounters mostly), and then a rapid skim of the rest of the powers for feel. So you might want to see if you can't shift one or two such down into the "early exposure" bracket for that reason alone.
In any case, it totally makes sense that it'd be
easier to branch things out at higher levels. One of the things I like about the Witch Doctor is that OBE managed to make it evocative and unique even at first level... that's a design goal worthy of emulation,
IMO.
Glad I was able to help.