Lesson 1 Effects of Controls: Select, Hold, Adjust.
Why NG as opposed to any other non-FBW swept wing, low wing-mounted with dihedral airframe?
I don't think Mr Boeing would release to the great unwashed a 'frame which increased bank after the initial application and neutralising of roll control inputs?
Clean, in theory the roll control has better authority than with flap, due to the spanwise distribution of lift with flap/slats deployed, but the roll control deflections are varied according to speed with inboard spoilers assisting roll at higher speeds.
All this extracted from my ancient brain after a few hours on the type, but doubtless someone with a better brain and/or access to the manuals will give more detail?
Still wondering why the question.......................