True. I'm thinking about it from the angle of seeker ability to acquire the laser spot, missile time of flight, and aircraft velocity. For example, a rotary-wing platform will travel about 500 meters at 90 knots during missile time of flight during a typical lock-on-before-launch (LOBL) profile. If for instance, you want to attrite a ZSU-23-4, you have to take that 500 meters into account to ensure you don't fly into the WEZ of the ZSU prior to missile impact. Obviously, as your speed increases, so does the range at which you must launch. Granted, this is a simplified scenario that doesn't take into account the ability to turn away from target during missile guidance (TPOD/LPOD/Sensor dependant). Thus, if you want to launch LOBL, seeker ability to acquire the laser spot may limit you to a max launch range that puts you closer the target than desired, given the time it takes the missile to fly down range and the speed of your aircraft. What I really think it boils down to though, is that the HF is a comparatively slow missile, and that creates issues with faster aircraft from a purely aerodynamic standpoint in the case of the missile and (I suspect) separation between ordnance and aircraft post launch. I'm not a fixed-wing guy though, so that's conjecture on my part.