That was shooting the component shots of a 360° panoramic image.
It may be someone shooting a series of landscape images (not unusual).
It may be someone working on behalf of a local estate agent (realtor... not unknown).
Or it may be someone...
... with a partially tumbledown entrance arch? I recall exchanging comments about this in a post you created about six months ago.
If you have a relatively recent mobile phone: you have a good quality still & video camera that you can use to do...
Davinci Resolve does have a very steep learning curve and the available tutorials can be irritating and confusing, but it is still the only pro-grade (and free) editing suite I have gone back to time and again because it is worth all the long...
The point of log is to capture more dynamic range, and to do that the sensor must be working in a certain optimal range. Bringing it down to 100 would wipe much of the benefit.
Some big cameras actually require 800 or even 3000 for max D/R in log...
As with most things, it all depends on what you can afford and how many times you're likely to use it (return of investment).
The real-world battery life of all DJI drones is nowhere near the claimed flight time as stated in either the specs, or...