In this context, I would like to contribute my perspective as a remote pilot with a slightly different focus. I agree with everything written here - without reservation. But I would like to add something:
I am concerned with rescue missions that I, as a pilot, know nothing about. Especially in densely populated areas with tall buildings, it is sometimes difficult as a remote pilot to hear an approaching helicopter that is on its way to a rescue mission. On the one hand, the buildings shield the noise, and on the other, there are many other sounds.
If I am flying my drone in cities in compliance with all the rules and a rescue helicopter is approaching at high speed, I can only react very late. As rescue teams can't always maintain the minimum flight altitude, I see this as a risk.
In such situations, I try to talk to the responsible people in advance and keep my altitude as low as possible in known approach routes.
However, I would find a standardized technical system in all drone models (such as ADS-B) that indicates approaching helicopters even better.
Best regards,
Francis Markert
https://drohnen-camp.de