My question was within the context of what should be in a
Glossary of Terms. I would not expect a GoT to tell me
how to do things to a given object, Regarding metadata jackets I asked
what's the reason for them,
why would I want, or not want them,
where would I get them
So when I tick this

in the Structure Detection sub-dialogue of the Conversion Dialogue - am I creating the digital equivalent of a Book Title Page or a Book Dust Jacket
In the Real Book world I would have thought that the Title Page and Dust Cover are two very different artefacts, with quite different purposes
If in the eBook world a Title Page and a Metadata Jacket are one and the same, then why have two terms, other than to confuse us non-aficionados. It wouldn't be the first time that's happened in the IT malaise.
My English teacher once made me write out in copperplate, in india ink, in my exercise book, the following maxim
"I shall use not different words with the same meaning, nor yet the same word with different meanings" 100 times
BR