This is likely to be indirectly addressed through the new multi-panel navigation. It has the close button regardless it seems, and upon closing the final panel you’d be taken back to the view you originated from.
Here’s a video showing this. Do note that this may not the final version of the navigation, I have enabled the experimental navigation.
An exception to this that I have found so far is when you search and go to that entity. Not sure what the close button should even do in that case—is it even right to have on there?