In my country its usually required for new builds to have 2 methods of heating. People usually have gas or heat pumps as primary but almost all of them puts a fireplace as well in the house, so chimneys here are very common.

I also have a fireplace additional to a heat pump, but I would only use it if there was a power outage for multiple days during winter.

So yeah, fireplaces are mainly for the vibes :)