By the time Paul wrote that letter, segments of the Jewish community were already criticizing Christians for appearing to go around the law, for reinterpreting it. The truth is, we do go around some of it, and we obviously reinterpret it. Early Christians emphasized the broad rather than the specific. Paul did the same and every honest Christian since has done the same. So let's confess that making love the law makes the law hard to keep and love hard to understand.
Love can be so abstract.
As a principal, it can be vague. And trying to keep it is scary. In fact, it's a very appropriate way for human beings to live. We are finite creatures who keep learning as we go. As you may hear, that's not good enough for some people who have grabbed the nation's pulpit today and who reassert the very point that Jesus argued with the Pharisees.