direct injection vs. carborator?

[spareparts]

as they explained it to me in Yamaha school. Imagine standing beside a cliff, your two steps back from the cliff, thats carburated, take a step closer to the cliff, thats fuel injected, take another step and dangle you foot over the edge, thats direct injected. The closer you get to the "edge" the more fuel efficient you are, but at the expense of margin of error.