Sounds great. How would you rate the usability of the Leica designed by Ive & Co. in comparison. Oh wait... you can't really compare either because you.. don't know either.
We can read reviews. I also have the common sense to know that a version with a hot shoe is more useful than the one without. And that the version with a hardened body and lens is safer from harm.
Moreover, the Titanium design which removed the old light input window and replaced it with internal LEDs, was good enough to later make it into production.
So I don't think anyone would seriously want to go on record as claiming that the dumbed down and smoothed over Ive version... the one without a hot shoe... is more functional than the other one. It's not even questionable.
Of course, as I've already noted, these custom designs are meant more for collectors than users, and so the point is not functionality. (Although I've run across at least one owner on the web who actually used his Titanium because it was a good, funtional design.)
But a designer can go any direction they wish, and Ive again took the path he likes most, which is form over function... something we've seen in everything from his computers with slots moved to the rear, to round mice, to iOS7.