i saw videos with strong wind and Tello holds up! On calm day 30 meters would be great. I hope that there is this improvement that get to 10 meters at the end you get tired. I do not say 50 meters but 20-30 meters.
Better video and 30 meters in height and the Tello would be a resounding drone!! In my opinion, the sensors work even above the 10 meters of height limited by software...