So much over-engineering comes from the fear of changing already written code. Some programmers, I believe, have the impression that changing code any reason other than new features or requirements is wasted effort. So they try and build out all possibilities they can imagine first so they won't have to change it later.
If you eventually need that interface, you can change your existing code to use it. Making that change is relatively easy compared to maintaining a bunch of code that isn't needed. But still I find it hard for some programmers to get past that mentality.
If you eventually need that interface, you can change your existing code to use it. Making that change is relatively easy compared to maintaining a bunch of code that isn't needed. But still I find it hard for some programmers to get past that mentality.