1. Since there are technical cameras available that can accommodate 35mm bodies, the swings, stitches, and tilts are no longer the purview of MF world. The same goes for Rodenstock lenses, and leaf shutter lenses or at the very least, HSS flashes that would approximate leaf shutter effects.
2. Capture One - Can't you use Capture One with your 35mm camera? There might be color profiles available or as some have mentioned, they create their own
So, that leaves the 3:2 aspect ratio. Is that enough to warrant such a price premium? I'm not negating it as a valid point, it is, but it seems this is the only point that can't be addressed (other than through cropping) with 35mm format.