It’s true that if you pass a parent form down into child components that any changes you make to the parent form will also show up in the child component’s version of the parent form. I would say this is a bonus feature. The way I see it, having one form as the “source of truth” makes it easier to make changes in one place and have if propagate down to all the children.

To your second point, I haven’t tried it that way yet but I assume it’s also possible. However, I’m not sure what added benefits you might get by doing that.