Remember the Starlight chorus rhythym game from a few years ago ? Remember when they implemented the Hauuke Manor instance and let you run around in it as whatever NPC you wanted to look like? Remember when they created the Valentione's Day maze? Pepperidge Farms remembers. They're too lazy to even make themed FATEs for seasonal events anymore.
Why can't they reskin game mechanics with a holiday flavor? Why can't they mix it up and have NPCs from one "Season" appear in others? It would be cute and fun to have the Songbirds appear during the Valentione's Day event story, or the Hyur girl from the recent Little Ladies' Day events appear in the Starlight quests? Or have the Great Gourd pull a "Nightmare Before Christmas" during Starlight? SE, those ideas are free, you can have them.
The most they're willing to do now is maybe put the Scions in the event artwork (though they aren't actually involved in any way). Seasonal events used to be something cute and fun to look forward to, but now they're boring.