It's complicated. I teach for living, and I want to do this all the time. But too often, we cover a tenth of the material in the same time because it takes much longer. Things sink in better, and this teaches the students how to think, but still… Watch a David Attenborough documentary where there's little hinting and foreshadowing, he just knows that he's got 50 minutes to tell you all about the way, e.g., different…
I would argue that is it far, far more important to teach kids how to think critically and equip with them with the tools to explore the world and learn on their own than saturate them with a bunch of facts and figures that they lack the capacity to intelligently comprehend and likely won't retain.
It's the difference between having API documentation and having a quick start + API documentation.