This is very very sound advice. How many _actual_ data structures are there in our day to day? Trees, graphs, buffers, arrays, hashmaps, state machines... Yet w

This is very very sound advice. How many _actual_ data structures are there in our day to day? Trees, graphs, buffers, arrays, hashmaps, state machines... Yet we tend to overspecify operations as if they are special (see: many applications of OO), when they really aren't. Another angle to look at this is moving complexity and specificity into data and away from functions. It's a recipe for success: HTTP/REST, SQL, CLI utilities etc.