Relationing to a face in a 2D sketch

I'm wondering why I can't do this, in some circumstances Ithink it would be more resilient to future updates or changes thanan edge or converted edge.

However on the other end, a simple cut will change the face andmight break the relation, so it could be just a hell of a lot lessresilient.

It would be cool to get some clarity on thisSolidworksSketching