It seems to me that there is enough video out there by now that we could find an example of each rule change to show how things are now different. (Show the clip once and indicate where the old enforcement spot was, then continue the clip to show what changed.) There's GOT to be a video of a Roughing penalty, caught pass, fumble, and recovery by A at a different yard line out there somewhere.
Interesting that while this seems at first glance to be a beneficial rule for A, we should remember that the fumble could travel towards A's goal line instead of towards B's goal line. In those cases, the old rule (enforced from the end of the run) would have benefited A more.