That being said, sometimes a good abstraction can really simplify a complex problem by dividing it up to a set of smaller sub-problems. In such cases, the abstraction is worth it even if there is no reuse. As always, rules like this have to be interpreted in a context.
It’s certainly a rule of thumb, I also prefer to break things down but I try to use functions as the basic units as they’re the easiest to keep in your head when it’s clear what they do
