There are as many reasons to take photographs are there are humans, and it's important to respect that.
There is photography for art, and there's photography for documentary purposes.
Finally, there's photography for nostalgia. (This is the marketing trope right here. That's how cameras are marketed!)
But it's not all bad. One of the most memorable parties that was ever thrown by me was in 2009. It all started with someone putting on a 20's and 30's playlist and it ended with everyone swing-dancing and jitterbugging the night away.
What makes it documentary is that someone grabbed my camera which was mounted with the 50mm prime and shot pictures almost continuously.
Every single one is out of focus (he was clearly drunk!) but it captures correctly the wild complex emotions of the evening (take that! your sharpness freaks!!) You can play it like a film (the man was seriously trigger-happy!)
It's "The Great Gatsby" as done for 2009 in film. Thank you, anonymous photographer!