Well, sure, there’s always been Christmas-related SW merchandise (I guess any franchise that relies on selling toys must have at least a decent amount of Christmas marketing), but it’s never been quite as blatantly a Christmas thing as it is now and will be in the coming years. All the other movies were released in either May or June, so the movies themselves was never tied to Christmas in the same way.
(Also I got an excuse to post a picture of my SW gingerbread starfighters. Which btw was far more complicated to make than you’d imagine.)