Comfort certainly Caph, but more cycling efficient, never, due to the vertical cyclic thrust of the effort input.
Thats why suspension is never seen in any form in racing on road or track, since it wastes energy. Only a very limited form of front suspension is seen in top level off road competition, and rear suspension never.
On motorbikes where the drive is a constant force without a vertical component suspension is best is the ways you accurately described, and of course that's where e-bikes are a compound case. A rider who only uses minimal pedal input and relies on the motor a lot can find suspension a good all round option, but with high pedal input suspension is an effort losing disadvantage, rear suspension especially so.
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