armand,
I agree in the sense that once one goes much beyond "normal" FOV, camera compactness is almost entirely about lens compactness through imposing limits on the effective aperture diameter (focal length divided by aperture ratio), either by accepting a higher minimum f-stop (f/4 or f/5.6 or beyond) and/or by using a smaller format, with smaller photo-sites then a key driver in the down-sizing. Only the wide to normal FOV range benefits much from body design changes like removing the SLR OVF assembly.