There is that.
From the 'adding choices to the game' point of view, making more things affected by province luck scale would be nice. There appears to be a general tendency for players to take a Magic scale anyway, so why add further incentives?
On the other hand, Misfortune seems to be taken over Luck most of the time. If there was a Nethack-esque approach to luck, with most if not all random rolls (slightly) affected by your Luck scale, it might require more serious thought before people took Misf-2 with their pretender.
Of course, this is all pie-in-the-sky really. I think it'd take too much work to add that sort of feature to the game.