I agree, if you need leaf shutter lenses then it doesn't matter about the rest of the system, it's not the right one. I'm using mine with a set of Hensel strobes and it works perfectly but I'm not outside overpowering the sun wide open with it so as it stands it's not an issue for my work.
As for interface, having the D810 here beside the GFX, I find the Fuji much nicer to control, I don't go for all the dials, they are locked off and I only operate from the body, aperture, speed and ISO are all very easy, I then have timer on a button which is easier than rotating the Nikon dial, I have bracketing on a button which is one press and turning exposure simulation off for strobe work on another and that's it, the only other thing I have is virtual horizon on the top button of the thumb grip, this is really nice to tap with the thumb and bring up, I don't use anything else and never have to go in to menu at all, now I have worked out you can reformat by holding the delete button for a second and pressing the rear dial.
There are things I don't like for sure, the first is the playback image doesn't stay with the orientation of the camera, I'd prefer it if rotating the camera would leave the playback image upright. I also don't like when shooting in portrait mode handheld and reviewing an image, holding the camera as normal, zooming in or moving the image around with your left hand, the eye sensor gets triggeres and turns the rear screen off, I think the eye sensor should just disable when in playback mode. Don't like the Q button, it's sometimes easy to activate it, especially when on a tripod in portrait orientation and the camera is lower than you, moving it around I hit the button, would rather just disable it but no option for that at the moment.
Other than that, I really like this camera, couldn't care less how it looks, with a face like mine, even a pretty camera isn't going to help!
Good that there are options for everyone.
Mat