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I concede that the solution solves the author's (IMO) contrived problem.
Other than that one case, what would it solve?


It's hard for me to answer for the "author", because I don't really like
his implementation. I just agree with the premise of designing software
which provides a "separation of concerns", as opposed to a "big ball of
mud".

I suppose it solves the problem of having to buy tools to analyze and
outline your software to be able to understand it. Instead, your software
implements a set of patterns which are cohesive and well-known.

Someday you may flip a switch in a service program which points its
procedures to a remote DB rather than the local DB without impacting
applications.

If your DB I/O service programs implement a known interface, someday you
may deploy a utility which automatically exposes all of them via REST web
services APIs.

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