There is actually nothing that says 2 stage rotations must be done with any aircraft. This is more or less an old habit, but itīs generally understood today that 2-3°/sec cont. rotation gets us airborne safely, no tailscraping, and of course the a/c needs to be rotated at the right airspeed. When weight is underestimated (American passengers
) a pilot might hesitate a little because the aircraft needs these extra knots to fly.
But, in general it is an understanding today that we only use one continous rotation.