The answer has to include how much cosine-law vignetting and how much color shift one can stand in the resulting image, given that sensor focal plane pixels work best or most uniformly if illuminated perpendicularly to the focal plane. The clear aperture at the camera end of my 400mm is 42 mm. So even using that aperture, a short focal length lens assembly could not be telecentric to the corners of the image, ff or not. In fact, the 25mm DFA is only about 28-mm diameter at the rear glass, so it has already given up some of the available telecentricity space. I don't know what the rear details are of the 17mm, but I'm sure that some additional compromise was needed.
With huge dynamic range, vignetting can be corrected in camera or in post. Color shift due to hitting the interference coatings at a steep angle could be more difficult to deal with.
Then there is the distortion aspect, ever more difficult to deal with as the angular field of view increases. Do you want pixel position to vary as f * tan theta (rectilinear), or as f * theta (equidistant), or one of the other common mappings? (See, for example, the description at:
5 wide angle lens design layouts.)