For homes that's okay. Except overhead lights are not as nice as lamps, so turning on all the lamps you use with one switch is cool. Modern high efficiency LED bulbs can have odd lighting so having a few of these in lamps gives a much nicer effect.

And we want to encourage people to turn off lights when they're not being used, so a single switch is again useful. This might be saving tiny amounts of energy, but we want to move to a world where this kind of behaviour is built in.