Rainboe is right, for a given total lift the bending moment at the root is reduced if the lift distribution is moved inboard.
The 787 has a 2E/3H architecture. It has three hydraulic networks (Left - engine-driven pump and electric (demand?) pumps, same for Right, Centre driven by two electric pumps). Each engine has two 250 (!) kVa starter/generators, the APU has two 220 kVa starter/generators. The RAT provides both hydraulic (to Centre system) and electric power.
Because of all the various electrical loads it has a 230Vac network, a 270Vdc network, a 115Vdc network and a 28Vdc network.
Spoilers and stabilizer actuator can be electrically driven following a full hydraulic loss, making the 787 controllable in the event of losing all ship-wide hydraulics (like the A380). The brakes are electrically driven.
A potential issue for airlines, because the engines are started using the electrical starter/generators you need a lot of power to get them going. If the APU is u/s you need three good GPUs to start an engine.