For several decades connecting via CXDG is a nightmare. Very long and slow taxiing. No sky bridges to connect to the plane or diverted. First, Bus transport to the security is slow, long, and in freezing cold, plain uncomfortable. Then the nightmare of security. Poorly trained employees, vague directions, very few security lines for a ton of passengers, total disregard for first class or premium passengers, inadequate instructions (should one remove shoes, belt, laptop...) are big problems. You board the bus again in the cold to go to a different terminal and gate. L is before M but is followed by K!
Over crowded and cluttered gates with toilets on another floor. You have to crowd near passenger passageways as the area near the gates are cordoned off by the airlines. To buy a cup of coffee, you have to wait in line for a long time as there is hardly any coffee shop.
France should take a lesson from other third world countries which as doing a great job of airport connections.