ProRes HQ is a big plus for editing high resolution video, like the 5.7k video the drone can produce. That resolution in either H.264, or H.265 will demand a very modern high powered PC to play the video without stutters and compression artifacts.
On the other hand, there are few uses for such large videos in the consumer world.
In the commercial world, when you are shooting drone footage to be combined with high end movie camera footage in making a film for Amazon or Netflix etc, it is very useful.