Zero watt standby does consume less energy overall than active standby. Even though you need to charge the capacitor, once it's charged (1 second or so), it's charged. Finito. No more juice needed. So if the device sits on standby for 14 hours, it's consuming Z-E-R-O watts. Whereas it's active equivalent is still chewing away at x hundred (or thousand) milliWatts.
True, capacitor manufacture does involve a bit more energy - but seriousy, how much?
And granted, in the grand scheme of things this is a veritable drop in the primordial soup, compared with 100W incandescent bulbs (sss, sign of the cross).
Paris, 'cos she went green by sharing accommodation with several thousand other inmates for a bit.