Six years is not that long. You need to have the frequency to finalize the design of your payload, if not your satellite. And for big constellations you need th

Six years is not that long. You need to have the frequency to finalize the design of your payload, if not your satellite. And for big constellations you need the frequency to talk seriously with your investors. So 6 years to design a platform, a ground segment and launch half your constellation is not an easy task.