Holiday events are just an excuse to put characters in outfits they wouln't usually wear and most of the time that means we just get a nice little extra scene
I'll always liked holiday specials! They add some unique scenes and arts to the game. Sure it postpones the ongoing parts of the game but who wouldn't like some random weird stuff now and then ?
A question I often find myself asking. There are very few things more disappointing than seeing a thread for a game you love get updated, only to realize it's a spin-off holiday special that has no impact on the story. I understand that people like the holidays, and you want as a dev to give something special to your community to celebrate, but at least for me, I would always prefer to celebrate with a big new update that expands on the story meaningfully, than a short spinoff that took dev time away from the content I actually want.