Is is really for missiles. Same reason the ITAR limits for accelerometers and gyros are relatively high (I think like 10g for acceleration). Same again for vibration tolerance. It is a barrier to entry for making a navigation system for missiles.
I fail to see what is so hard to believe that an actor _could_ use civilian parts to get military capabilities. Yes, sure the are points about performance and reliability and what not but I can't shake the feeling that at least some of those points are exaggerated or marketing speak and the re is obviously a point where these components are good enough to be dangerous.
ICBMs on the other hand, reportedly go ten times the speed of an F22.