The whole OM design was based around a mirrorbox, which was there because it contained a mirror. If you have an EVF it means that you dont need a mirror, because you grab the image straight from the sensor and project it to the EVF. That was the whole point of the EVF to begin with, to do away with the mirror. Putting a mirrorbox and/or a mirror on a camera that doesnt need it, just for nostalgic styling purposes, sounds as stupid as wearing a ski suit in the desert. Whats next, an artificial mirror sound?
The main attractions of the OM system were a) the bright and massive optical viewfinder, the biggest one ever built. And b) a selection of about 70 lenses that covered everything from 8mm fisheye to 50mm/1.2 to 1200mm/f14, and an incredible amount of useful accessories to customise your camera as suited your needs. And of course it was full frame, which didnt say much at the time because everything was full frame, but little did we know.
If instead of all that you guys are happy with anything, no matter how oddball, as long as it looks like an OM and has analog controls, then what can I say... I must have missed something very important that happened to the collective photography subconscious over the last decade or so.