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Very useful! Discussions about website copy often lump all text together as “content”, but clearly this microcopy is more about usability and design than content. That said, the distinctions between all of these labels ultimately break down when you consider how inter-dependent they are.
However, there is a danger that too many words in an attempt to clarify will actually obfuscate. This puts me in mind of an Open University course that had 4 times as many pages devoted to instructions for writing an assignment as were in the original material being studied. Every time a student showed evidence of missing the point, the course directors would add more explanation.
A little goes a long way and maybe best saved for those times when common conventions and user expectations are being tweaked.