Fortnite's current, big comet event was the start of something brand new for the cheery battle royale game. Nowadays, you don't need to wait about for a particular event to see the map change.
Case in point: there was once a small crater in Tilted Towers, just with the new 4.2 patch, it's been filled in. Epic Games, the programmers, also added some smaller details which make it look as if a construction crew was hard at work salvaging the wreckage.
That is not all. Weeks before, the landing place was not very developed--catastrophe had just struck.
These are just a few of the most noticeable changes. Players are reporting smaller tweaks all across the map, all of which impact the game visually without messing up any of the game play with
Fortnite Items.
It's possible that Epic is doing a gradual build-up for something large in the close of the season. The map hides a lot of unexplained keys for Epic to simply let those details go to waste. But right now, I do not really care what it all "means." It seems cool to load up my favorite game and understand that something will differ. Fortnite may only have a single island, but the map isn't static. It is continually changing. It feels rewarding to see it happen in real time, because I understand that anyone who plays afterward will not get to find out what I did. It's also cool to feel as the multiplayer does possess a "narrative," albeit a very understated one. These are not things that I normally experience inside a competitive multiplayer match.
Epic is sensible to keep the soul of this comet moving, and they do not even have to keep ruining the map to pull it off.