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"Drag and drop enabled for nodes in Inspector markup view "

This is going to make me never use Chrome dev tools again. Nice

I can't think of a situation that would make me want to move nodes around from place to place. Where would that be useful?

"Lets see how this document looks when I move this content over there"

A position:absolute div with position:relative parent made sibling of the parent can behave differently.

Chrome dev tools also support node drag-and-drop as well as ctrl-x/c/v in the Elements panel.

Yes, and now that Firefox has this, I do not need to swap to Chrome to use it.