A drone can in fact not accelerate in any direction at any time. It can only accelerate along the thrust vector which is the normal of the plane that the rotors sit on.
That’s a distinction without a difference. In theory, of course you’re correct. In practice, your parent comment is correct.
The rotation rate in the roll or pitch axis is around 1080 degrees per second - 3 complete revolutions per second. Many freestyle pilots fly higher rates than me.
I can, and do, go from 80mph in one direction, flip 180degrees to accelerate back to 80mph in the direction i just came - a 160mph change of speed in around 5-6 seconds approx.
The only axis i cant turn very fast in is yaw (quads have poor yaw authority compared to other axes) but even then it’s fast enough most people would consider it instant.
