obstacles can jump out into your way.
Yes, I have done very similar things in A mode, especially when I was learning. That's why I started practicing in A mode so if a situation every occurred when GPS wasn't available, I would be prepared. That situation was much more likely with the P2, and not so much with the P3, but you never know....I was able to hit a tree flying over a football field in Atti mode. I lost track of nose orientation, and full throttled right ... and sent the copter left. I let go of the stick expecting it to stop, but ... oops.
Fortunately that was with my P1 in my early days!
Atti mode would allow a higher speed in the P2 but the P3 gets no speed increase.Faster speed for speed freaks.