The right abstraction means it has to be changed in one place. The wrong abstraction means the change cuts across abstraction boundries, which means changes all

The right abstraction means it has to be changed in one place. The wrong abstraction means the change cuts across abstraction boundries, which means changes all over the place, or having to de-abstract and duplicate before making the change anyways. Of that happens frequently, it is a smell that you are abstracting too early and thus building bad abstractions.