I don't think it is G.A.S. Nobody ever wanted to carry a full Phase XF or Hasselblad H kit and lenses You only did it if you had to do it in order to achieve the level of IQ that met your goals. The trade offs 10 years ago between IQ and size/weight of the kit were different from today. The Fuji GFX and Hasselblad X cameras that came out six years or so ago with excellent lenses significantly closed that gap, and the more recent iterations with the 100MP sensor (along with astonishing developments in AI technology for sharpening and upsizing files) have for all practical purposes eliminated the gap to the point where it has become almost impossible to justify the cost and the inconvenience of using a "true" MFD system today. However, there are only three camera manufacturers in the world today that appear to be capable of designing a camera with an intelligent UI that is not hopelessly cluttered with options and features. Hasselblad, Phase, and Leica. Phase and Leica are still offering MFD systems, but they have become dinosaurs in today's market. There is no reason to believe that Phase is ever going to invest the capital to develop a new mirrorless platform that would compete with the GFX or the X2D. Leica has given hints that it may do so, but Leica has never gotten the marketing memo that its cameras need to go on a diet, so I find it hard to be optimistic. If Leica were to release an S4 and a line of lenses that are scaled up from what it has done with the SL2, it would be dead from the start. Nonetheless, I hope Leica can figure it out. Another competitive player in this niche that knows how to design a camera with an intelligent UI would be great.I wonder if the impact of Fuji MF cameras started and accelerated the trend away from MFD at about the same time as many of us older users were contemplating downsizing our gear and migrating away from MFD. Or did we just need a reason? G.A.S.?