I think the Exakta should be in this list. It was probably the first small single lens reflex (127 and 35mm) of modern design. I suspect they were among the first (if not the first) to have lever film advance, optional waist-level or pentaprism view-finder, etc.
If the criteria are functional features that advance the practice of photography, you are quite correct, Exakta introduced all of the features you mention, in addition it was one of the first to have preset lens aperture, and a mechanism to close the aperture via the shutter release mechanism.
But although very advanced in design Exakta also acquired a reputation for not being very reliable, and the lenses available for the camera system were very mixed in performance quality.