That's a ridiculous statement. Very early on, prior to TTL, they brought out a very wide selection of lenses which included teles so big they resembled Naval artillery more than a camera attachment. Yes, aerial photographers prized this camera, and there was even a dedicated underwater housing system for it. Making it look and operate like a giant 35mm SLR certainly helped those wanting to intuitively transition up to 6x7 format. And they had a grip to facilitate handheld us with flash, and a couple of leaf-shutter lenses appropriate for that kind of studio handheld application. But it's relatively limited in usage handheld. I sure learned that early on myself, even with normal and wide-angle lenses. I can remember one long strenuous early trip plodding over seemingly endless ice, rock glaciers, and talus fields, and whenever locating a tempting shot, having to find an appropriate boulder or log to rest the camera on. When I got back the lab dunked my Ektachrome in C41 chem and ruined everything. Never again that lab; never again without a sturdy tripod. Sure, I've gotten excellent shots handheld too over the years; but that was contingent upon a combination of factors generally including high shutter speeds, high ASA film, and relatively distant subjects manageable with relatively wide f-stops. I suspect some of the 35mm-ish shape was not only related to improving handheld ergonomics, but avoiding the reverse curl film issue of MF cameras with interchangeable backs, which still seems to have been a legitimate source of complaint way back then.
