Yeah, agreed, but I believe DJIs smarts in their battery won't allow the battery to be below 3.3V or somewhere in that neighborhood, while flying. If I recall, in a P4 at 0% in the Go4 app is around 3.3V isn't it? However, I'm pretty sure DJI still has the auto-off enabled at 3.00V, which seems risky.
Many of us remember the P3P's falling form the sky with 1.5 firmware in Dec 2015 right? That's because their "intelligent battery" turns off at 3.00V, regardless of the flight status. Is that intelligent? My information from DJI (at CES, which sometimes you can't believe) personnel said that their 3.00V shut off routine is to prevent the battery from draining below 3.00V if you accidentally leave the craft turned on overnight, as a protection scheme. I told them that's fine if the craft is not moving. I suggested the battery should only be allowed to shut down if it's not moving. But they said that's impossible (I don't believe that) to do, claiming the FC can't talk to the battery, providing permission to shut down to the battery. So DJI elected to put a governor on the throttle in FW version 1.6 after the battery cells discharged down to 3.6V, at which time you didn't have full power in the P3P. That was their fix to mitigate high throttle scenarios (full forward throttle right stick + full ascend throttle left stick) from taking the battery down to 3.00, triggering shutdown. This mid-flight power shutdown protection with craft falling (excellent protection, right?) from the sky happened mostly in cold climates, it was a rarity in warm (greater than 60F) weather areas. Today with bigger batteries DJI doesn't see this problem at all anymore, and their 0% battery level in Go4 is way above 3.3V, way out of reach of getting down to 3.0V, which can trigger auto-shut down if reached.