I also thought "why" but I guess I'm as likely to use this as I am to use Alfine without it (that is, not very likely).

I always think of something BikeSnobNYC said when the DuraAce Di2 system came out, "Electronic shifting will completely change the way you think about bicycles--assuming, of course, that you previously thought of them as being relatively inexpensive and easily serviceable." But I guess Alfine 11 users don't think of bikes as inexpensive and easily serviceable anyway, at least not the rear hub.