> The 25 is there in the name. It's the whole point :).

You're overly attached to the meaning of Advent, but you aren't even aware of the meaning. It doesn't mean exactly 25. This year Advent Sunday is November 30th.

And the creator of Advent of Code can do whatever they want with it, despite the name. They've put an immense amount of effort into this for so long - if that had been me, I would have been incredibly disheartened to see people saying "the whole point is just 25".