The switching to A trick probably shows you 80% of what the actual windspeed is.
Map Pilot will trigger the camera based on the overlap and altitude settings that are specified. If it is going up wind and slower, no problem. If it is going down wind and faster, the aircraft could be outrunning the speed that allows us to take the images at the camera's maximum frame rate and images will be missed.
It is always best if you are mapping in a strong wind ( >12 mph) to align your passes to be perpendicular to the predominant wind direction.
The aircraft does not know if it is downwind for the sake of RTH for battery so it is always best to fly your mission into the wind direction so you will be downwind on the way home.
Map Pilot sets a fixed speed of travel which seems be airspeed. In the presence of a strong wind and a commanded flight speed of 20 m/s, it will do 15 m/s into the wind and 25 m/s downwind. In both of these cases it is working equally hard since it is only maintaining an airspeed.
There is no battery load measurement or equivalent that gives and ideal of the relative effort involved in any maneuver. That would be a good feature for DJI to add.