An additional advantage of the Tree approach is that the hoisted node is collapsed in the parent tab, as well as getting its own focused tab.

This means that you can toggle back and forth, with single clicks, between pruned overview and narrowed focus. The OO3 drawer only gives a toggle between hoisted and not-hoisted (or between various hoistings) there are no automatically collapsed parent views.

(In Tree, closing a hoisted tab also re-expands the node in the parent view).