Other than potentially reducing maintenance costs, I'm not sure any other part of this stacks up. I don't see how electrification would allow you to save weight in other parts of the aircraft. I don't think electrification adds any new propulsion capabilities that are more energy efficient, not for airplanes or boats anyway. For boats, the electricity would still be turning a screw and for airplanes the only method of propulsion that would work is an old-fashioned propellor. That last is the same reason you can't fly electric planes in new performance envelopes: prop planes can't get that high and wouldn't work if they somehow found themselves up there. Even turbo-prop planes (which have gas turbines that enable them to work more efficiently at high altitudes) are limited in altitude by the fact that the tips of the propellors are going very nearly the speed of sound.