File locations inside the ebook are utterly inconsequential. Indeed, in all ebook formats apart from epub, you cannot even control those locations. As such I do not want to waste UI space on showing them.
It is going to be confusing to people coming from Sigil, but that confusion will pass eventually. Hopefully people will eventually stop worrying about where the file is inside the book, and just put everything into the root. Let Edit Book manage displaying the files for you. And if organizing the files inside the book satisfies some OCD tendencies (which I can well imagine it might), you can always do that as I have indicated before.
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