It seemed to me that choosing powers currently allows a player some control over the complexity of their character. I can certainly remember trying to decide between a power that was straightforward and one that was complex. By straightforward, I mean you can use it most anytime and its effects are easy to understand. By complex, I mean that it was better under certain conditions that you might have to work to bring about and the effects may be conditional on other things.
So, a player has some control already, though it seems that Essentials makes it all more explicit.
So, a player has some control already, though it seems that Essentials makes it all more explicit.