If all you have is a hammer you will eventually come across things that are not nails, but close enough you try to approximate them as nails. As the abstracts g

If all you have is a hammer you will eventually come across things that are not nails, but close enough you try to approximate them as nails. As the abstracts get more and more leaky you get the "biggest mistakes". I don't think really it matters what it is, if you take it too far it will fall apart. I think clearly this applies to functional programming as well, and probably every other way of thinking. The issue with OOP is that it is taught, and for many programmers they think it is the only way to think so they try to make every problem a nail.