Actually, for me, and in my experience, most of the DEs that have a narrow window re the shaving angle are the milder ones, such as the Superspeed. Too shallow or too steep and the razor will not cut. Which is why some guys say they are "too mild", and they "can't get a decent shave with them".
I get great shaves with my Superspeed, I believe because I pay particular attention to that angle.
Most of the razors that many people call aggressive are like this one. There is a small window with regard to angle where you can get a comfortable, close shave. Too shallow won't cut it, but too open of an angle results in scraping and uncomfortable shaves.
IME.