The very close lens to sensor distance means that the light is hitting the sensor at a very acute angle causing all sorts of problems. Leica ... developed some offset microlens technology to get round this issue but even then they had to go for a cropped sensor because the edges were still an issue. What used to be an asset allowing better lenses is now a problem with digital.
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Agreed, except that it was Kodak that developed the off-set micro-lens approach. Also, even with those micro-lenses, Leica apparently needed to design the new more telecentric 16-18-21mm Tri-Elmar for good wide angle performance.
And lens design changes is a major problem for RF compactness. Once wide to normal lenses must be redesigned to be adequately telecentric (light hitting all parts of the sensor not too far off perpendicular), the designs become like DSLR lens designs, losing all the size advantage of traditional rangefinder lens designs. The remaining RF size advantage of omitting the mirror and VF hump will probably be dealt with, if at all, in other ways, like the side-swinging mirrors and porro-prism VF that Olympus has used from time to time, or eliminating the optical VF n favor of a sufficiently good "live video" viewfinder: a rear LCD and/or EVF peep-hole.
My vote is for a big, sharp, bright, rear screen with a fold-out shade-hood.
