I started reading the book “Pragmatic Programmer” by David Thomas and Andrew Hunt today and they were outlining the fundamentals of programming that last the change in technology and trends. One of those lasting practices is abstraction. Good abstraction is very valuable, and that theme sings true in the fastai library. Reading through the High Level API section, it is apparent that the abstraction layers are built into the library for the same reason that abstraction is powerful.
DRY That is, “Don’t Repeat Yourself”