How does reducing speed in turbulence improve the ride?
Who said I wouldn't write in the book? The ground check is negligible. What's worse: overspeeds in the range of 5 knots OR low speed at hight alt with possible forced descends to keep on flying. Alternatively sticks shakers/pushers activating. As I said: follow the manufacturers guidelines. Nowhere does Boeing prescribe speed reduction in cruise. If we are talking about climb/descend at 280 kts iso 335 kts it another matter.