When the new flagship Fuji X-H1 mirrorless camera was announced last week I watched an B&H interview with a Fuji where the rep (Justin) started off by saying something like - we had to make a professional robust body, so we had to increase the size of the camera:
"we need a body that is a little bit bigger, a bit more robust, that was sized right but also gives us the chance to use more technology"
Here is a size comparison between the two-year old Nikon D500 ($1,896.95) and the new Fuji X-H1 ($1,899) - both are APS-C cameras (courtesy of CameraSize):