It's true, there are usually multiple ways to solve a problem like this.For example, even after animating something, you can LINK it to a DUMMY object, and them move the dummy object. That would actually work rather nicely for my example given.
But it's an indirect solution to the problem. So I though being able to "fix" the keyframes, rather than working around the situation, would be nice.
That way you also avoid strange, unanticipated behavior later, possibly resulting from combined things that complicate stuff like rotations and scaling.