>The utopian bits were never really explained, either.

It's worth remembering that social organization (currency, capitalism, democracy) is a technology as well, and we should not expect that a sci-fi author can explain the advances in that technology any better than they can explain a warp drive. (one nod to this I think is telling is one scene in the movie where they travel back in time and Kirk is telling the others 'they still use money' in much the same way that he would say 'they still use guns'. They have replaced guns with phasers and replaced money with something else and Roddenberry can give us the blueprint for neither).

I think it's a sign of the times that people are kind of forgetful that this is an area in which we could advance - either insisting the status quo is somehow the best possible or even completely god-given natural or insisting that the answer is really obvious and doesn't require deep thought, research, and experimentation.