You are absolutely correct RAT 5. Checked my logbook, actually only 1500 hours yet on the 777 and only 75 landings as PF on the aircraft. That really IS measly. And that is one reason I am actually interested in the wisdom of others with more experience. I'm not going to buy anything about the steerable aft bogie however.
But this is a problem with long haul-operations. The PF during this landing at Schiphol may have been flying the aircraft for 2 or 3 years and never have encountered conditions even remotely close to these (on type!).
Without implying this happened here - I do remember overcontrolling in roll during my first gusty approach on the 777. As someone else stated in this thread, it can be touchy in roll.