It may be applicable to all Boeing types. The reduction is applicable to at least the 737, 767 and the 787 (if you would fly it with manual thrust). The reason I heard was that you have more than adequate manoeuvre margin with Vref +15, and that all those 5 kts above that are doing is getting you closer to the stall max flap speed and increasing the risk for long landings and the associated problems.
Last edited by tttoon; 11th May 2018 at 06:09.
Reason: Thanks NGsim, slip of the keyboard