Earlier quoted context omitted.
They don't magically work. You'll understand the mechanism when you know a bit more about how to build a measure tape and a saw. Also, all the so-called magic is extensively and automatically tested, and so an order of magnitude more reliable than your own custom-rolled spring mechanisms.
Exactly. This is why the article is such a bad analogy - frameworks makes things simpler by handling things you'd already do without them. If you're making a spice rack: Without framework: DIY shed filled with tools Framework: IKEA
Frameworks are tools, not end products.