Abstraction, like optimization, is nice when it serves a purpose. If it doesn't serve a purpose, you're probably just making your program harder to understand for no reason. You can see this in Java too, with proliferating class hierarchies introducing needless concepts. Haskell is also a research language and there are people working on abstractions for the sake of it, much like mathematicians sometimes do. If that's not your interest, just write programs that work and don't worry about being abstract for the sake of abstraction!