Indeed. The nomadic lifestyle can be a lot of fun and there’s nothing preventing you from playing that way.
I don’t know what it would take to implement something like that (a constant encroaching danger of some sort, I mean) and it would probably be easiest to just ramp up horde spawns the longer a player exists in a particular map tile.
But, right, the main issue I’m seeing is the vehicles, as mentioned. Even using the default vehicles, a hippie-van or RV is already a very basic mobile base. Even a car with a trunk can be used to hold a lot of supplies and taking away the ability to modify a vehicle means all damage would be permanent.
You could blacklist vehicles, I suppose, whittle the list or just give them bicycles and nothing else, but at that point I don’t know if I’d be having fun anymore.
All that said, I don’t hate the idea. I do think that currently there’s a real lack of danger for the player on any given day (other than the first day or so of any given start) and would like to see something adding a constant ambient pressure if it could be implemented in a quality way.