Arbitrary deadlines are not a good idea for the health of a game.
Sometimes there will be updates that rebuild game systems, sometimes there will be updates that add content, sometimes there will be updates that add details to the game, and sometimes a mix of the three.
NRFTW is not a game that has predictable updates all of the same size like Fortnite, Updates should ship when they are ready, just common sense.
Imagine having a finished update but not releasing it for a couple of months because you have to wait for the anniversary date, or even worse having an update that isn’t finished and is full of bugs and then releasing it because it’s the anniversary date.
We know that the devs are working on NRFTW and more than once a month they update us on the situation just look here: Updates and discussions from the official Discord or follow someone like Ginger Prime.