I absolutely disagree with this.
In the context of photo management, a DAM must included both organisation and non-destructive editing. These are expected features these days and without them what's the point?
Fixx (post above) says "I am not sure people understand that it is very different animal compared to plain vanilla pixel work. It just may be too hard to built application with instant non-destructive editing.". I disagree with this too. People are very aware of the difference and it is clearly achievable as applications such as Aperture, Lightroom and Capture One demonstrate.
My view is that with the demise of Aperture, the market is crying out for a modern replacement. All current options fall down in one (or more) areas. Lightroom has an ancient UI and some poorly thought out workflow decisions. Capture One has only basic organisation functionality. Neither integrate with the macOS ecosystem well.
Anyone who nails it will have the market for their taking.