The two aren't mutually exclusive, or shouldn't be: over the years I've seen plenty of examples of software that manage to be both powerful and fairly straightforward to use. And of course some less impressive examples which manage to be neither.
The lack of accessibility to the editor has been a bit of a problem, though, which is probably a major cause of the modding scene not really taking off with D:OS; in which case it ultimately didn't matter how powerful it was, because hardly anybody used it.
