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A narrow interface handling a large number of concerns... makes the UNIX file API a "deep" module."

Seems self-explanatory to me. "Deep module" [0][1] is a well-defined term.

[0]: https://dev.to/gosukiwi/software-design-deep-modules-2on9

[1]: https://www.amazon.com/Philosophy-Software-Design-John-Ouste...

Honestly the only minor criticism I can see of the OP's writing is to remove things that make it seem more disjointed than it is - dashes, unqualified pronouns (what is "it"? AWS? UNIX file system API? a particular module? all modules?). That's all.

Thanks for your advice. I agree and will try to improve on this for the future

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