In simple terms, the Airbus A380 typically achieves better fuel efficiency per seat mile than most variants of the Boeing 747 ...

The extensive use of composite materials allows the Boeing 787 to have larger windows than previous-generation aircraft.

It was not a complete reversal; passengers will still be able to leave liquids, aerosols, gels, etc, in their cabin baggage. They must, though, be in containers of 100ml or less.