Originally Posted by
enzo0511
going twice to the airport especially CDG is a just not the best idea
No-one is compelled to go to the airport twice - it is only intended for those for whom the service is useful. Such as those who will drive/travel to the airport the evening before and spend the night at an airport hotel.
City check-in is useful, but only for those people who are actually already in the city. These people should, however, find it much easier to make it to the airport for an early-morning departure than those who must first travel a long distance to reach the airport.