Navigator
Regarding the Navigator, when an element is deleted, it scrolls up to the top. When there are not many elements (that fits in screen view) it’s not an issue, but when you have a long list, and need to delete multiple ones, it’s less convenient. It would be nice if it stays in place.
Inserting Sections
I always find it tricky when I need to insert a section between other sections. All the quick inserters don’t work as you need to have a preselected element before inserting. (so you have to insert it in another section then move it) Drag and drop also doesn’t work in this case.
Some time ago there was a plus sign on the page (default in block editor) that allowed to do this, but now with that removed doesn’t seems to be other way around to do this.