I'm very anti-work, but one night in that environment with no shelter and food and I'd be dreaming of an office space. That being said, there is definitely a better world somewhere between working 50-80hours a week and sleeping outside with no shelter or food.
You're comparing what even our ancestors before sapiens had against the modern world. How about Babylon? Or the native Americans that so many "civilized" Americans ran off into the woods to join. Survival of the fittest was absolutely a thing sure, but at the same time, look at people's lives now, look at healthy people's lives in Brazil's favella, Gaza, Sudan, war zone or not. I live in the wonderful capital of Scotland yet there are people on the edges who have lives worse than a 3000bc person.
Why wouldn't you have shelter or food? Emergency shelter takes an hour to build if you've never done that before and as long as you can tie a knot and find both woods and stone you can have a reasonably durable shelter in a week.
Food is even easier as long as you did literally any outdoors skills as a kid. While the picture suggests a landscape a bit north and a bit alpine, fish, berries, root vegetables and/or tree nuts will be available to you all year.
Take a survival and foraging course. A couple weekends of education will save your life when capitalism inevitably collapses.
I have taken a foraging course! My wife and I actually forage a small amount. But I've never taken a survival course. I'll just freeze to death and I'm ok with that.
You should, at least one working with primitive shelters. Once you understand how easy it is and the relatively low maintenance requirements you'll start getting into Bushcraft, and from there you'll want land just to make little log-based moss covered shelters that can last for decades.