Perhaps I was being a little hyperbolic, but when I looked through the viewfinder of a .58 Leica at Tamarkins when I was in Chicago a few years ago to see an Aaron Siskand exhibit at the Art Institute, I thought the subjects were very small and it would be difficult to focus and frame, so I would prefer a .72 Leica when shooting with a 28mm lens. Of course, if you used it as a specialty body and also had a .72 body and/or an .85 body, I guess it would be workable for certain kinds of images once you got used to it. I know you have a slew of different cameras to use, so perhaps the .58 Leica is perfect for whatever you use it for.
By way of background, my frame of reference is a .92x viewfinder in a film SLR (not unlike the .91x viewfinder in the Leica M3), so I found the viewfinder in the .58 Leica pretty unimpressive. I also have two digital cameras: a Fuji XE2 with a .62x viewfinder and an XT2 viewfinder with a .77x viewfinder, and I prefer using the XT2. I relegated the XE2 to backup. I could use it in a pinch if I had to. So no, I am not making anything up, just expressing an opinion.