First reply, be gentle.
I think the problem you're describing is one that results when an expert tries to teach / design something to beginners and they forget how to present the information in an approachable manner. Sure, with code it _seems_ like "duh of course you need to _know_ the libraries to use a visual editor!" but that goes against the basic concept of having a visual styled IDE.
I'm a UX / visual design guy very interested in learning to program, have been for several years. But it's just not approachable beyond stuff like CodeAcademy, as it quickly becomes a labyrinth of documentation, cryptic instructions, and unclear ways to approach building a worthwhile program.
I digress, as that's not my point. Point is, many visual editors, even Quartz Composer, fail on the same area; they aren't approachable beyond tinkering with the switches and buttons. UX isn't even a passing thought on these tools. I would love to participate in building one of these tools and learning X language in the process. Until a visual designer is involved, these tools will continue being relegated to tiny niches unless a visionary developer comes along (-and actually completes the thing, as was mentioned above about the LightTable Chris guy).
I'm not saying design is _the_ answer, but all the best tools have been co-created with a visual/ mechanical/ industrial/ designer of some kind.
