< No speed is the most important factor

Bullets (Or rockets. Or shells with proximity fuses) go much faster so obviously speed isn't the most important factor.

These are anti-aircraft interceptors, intercepting sound like a critical part of the job.

> drones don't maneuver much, if at all.

Yeah, drones didn't fly at 700km/h much if at all either. So can an interceptor drone traveling at 700km/h reliably maneuver to intercept an enemy drone? How well can it do it when a human is piloting?