Recovering a car from a remote area can be a big job. Not only do you need a vehicle capable of getting into and out of the spot where the first car got stuck, it might need to do so while also carrying the first car.

Dragging the first car to where you can get it on to the recovery vehicle can cause significant damage to the trail. Repairing that can be a big job when you can't just drive a tip truck full of sand/gravel/rocks to the spot. It's not at all outlandish for the consequences of a stuck Subaru to pretty quickly run to "We need to contract a high lift capacity helicopter for a few days to fly in a half tonne of gravel and a repair crew".

And then there's the fact that to some degree, you're endangering the people who need to come get you.