It would be great if it was possible to go to the parent Block of the current Block. Sometimes you have the Back-Functionality, but it's not always working and not exactly what is needed. Most people need to navigate through the block hierarchy, for example if you translate content. You will localize a deep child block in all langauges, then you want to go to the parent block to find the next child in that container which needs translation. But it's not possible, you have to go through the page tree to find your page, then your block, it's child and so on until you find then one that you are searching. It should be possible to go directly to the parent.
So basically make "For This Block" clickable:
In this screenshot the message "this item is not used anywhere" is misleading. Actually it is used, but all blocks are in draft of the same project.