Except that the obstacle sensors don't work well in the dark and your Drone could lose its orientation, and wont be able to judge its altitude easily...It has a much better chance of ending up in a Crash.
All this worry about RTH altitude control malfunction is easily avoided by just flying the drone yourself. Better to be the PIC than a spectator.
If you lose position awareness for the drone, it's dirt simple to follow the rubber band line on...
Air 3S also is capable of 1000m, when more than 50km from the nearest airport.
However, the location clearly is not, based upon the map.
Needs an altitude hack, only available on older aircraft.
As we move to A.I I think operating systems will mostly be for us geeks the rest of the world will move to little monitors that "Do it all". and answer every question.
Max height and RTH height aren't the same thing.
In your settings, set your ceiling at 400 feet. If the drone RTH goes over your max height, THEN you have a malfunction.
Saying you stay below 400 feet is fine but the RTH height is a minimum...