4 Use Cases to Determine What a Zettel Should Be

The Zettelkasten note-taking method has made book writing and writing scientific papers easy for hundreds of years already.
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Please make these into a book!!! It's driving me crazy to link across. The material is fantastic! Thank you!
That article says:
I will note that 1 and 2 are use cases for information retrieval, and 3 and 4 are use cases for what I guess I'll call information "repurposing" (i.e. use of existing note text for a purpose other than the ZK).
But the ZK also has potential functions in information encoding (i.e. writing a zettel in a standardized way affects how you think about and capture the information) and information generation (i.e. putting the zettel into the ZK idea structure through IDs or links creates new ideas/information).
Were the use cases meant to be exclusive?