What do you mean “the discover and fix phase is over”? That implies that safety critical systems stop trying to discover problems and fix them? In what world is that true? You are always learning from mistakes and fixing them. Forever.
> In what world is that true?
It's true in this one. Companies will design drones that comply with the very detailed regulations and go no further the same way car companies don't put seatbelts, airbags, or auto-brake devices into cars unless forced. The drone regulations are nearly done. Any further changes may take an act of congress.
https://www.regulations.gov/document/FAA-2025-1908-0023
You can select a few comments at random and quickly find a pattern: people are concerned that the drones everywhere except in the densest of areas do not have to see where they are going. If they hit a manned aircraft it's the manned aircraft's fault and the drone operator has no legal liability. Does that sound like something FAA employees wrote themselves? How much motivation will be there to "iteratively refine" when they have no legal liability and even admitting that a possible improvement exists would create legal liability?