Disneyland at Christmas time has changed very little in decades, because it doesn't need to. It's classic, nostalgic, and heartwarming, exactly what its supposed to be. In a chaotic world outside, many people desire that constant.
However, at DCA, it is truly a Holiday celebration. Every major holiday from around the world is represented. That celebration continues to grow and evolve, as it should. Instead of providing a constant, it both embraces and celebrates the diversity of a changing California.
This season has always been when the Disney brand shines the most imo. I have many issues with how Disney is managed currently, but Christmas Fantasy returning is nowhere on that list