Moving Romex (or other NMB cable) to under the subfloor?
Unless there is something on the underside to prevent this, it would APPEAR that you should be able to drop the wires under the floor where they come down from above and turn - of course, that would require freeing up the wires so they can be re-pulled, or a mess of a junction box.

And there's the fact that this was not what was done to make me question if there is something blocking from below, or if it was just lazy weirdness when removing a wall that lead to this "interesting" approach.