As a casual observer / enthusiast, I have been intrigued by Boeing's choice to go with single-slotted trailing edge flaps on the 787 wing. Even the inboards appear to be single-slotted. This is quite a directional change in design philosophy when compared to virtually every other large commercial jet, where the inboard trailing edge flaps have tended to consist of at least two sections (e.g. 767, 777) while the outboard flaps were single-piece Fowler types.
Could it be the composite materials that influenced the design decision? Or is it purely weight and / or aerodynamics?
Personally I like flaps that are mechanically less complex. Seems like they are less maintenance intensive, and obviously still able to get the job done at low speeds.
[Edited 2011-08-13 08:42:09]