That's the incidental (necessary) vs accidental (avoidable) complexity distinction. But I don't think it makes it any easier to deal with.

those are different things. Often you don't plan for all the necessary things and so it doesn't fit in - even though a better design evists that would have it fit in neater - but only years latter do you see it and getting there is now a massive effort you can't afford. The result looks sloppy because on hindsight right is obvious