Long-time reader, first time poster.
I'm completing the lightning components trailhead modules, and am a little confused about the difference between facets nested components.
From the demos, it feels like both are the practically the same thing. You can put a component inside a component, and you can put a component with a facet inside a component. Both let you set attributes in the child from the parent, and I can't really tell the difference in behaviour, and when we shoudl use which.