Is there really a point to jobs? think of how the cavemen did things!?

Cavemen created their own devices that they HAD to have, these days we create random non-needed things. Also to get a job you need schooling, and I believe that schooling is one of the number one causes of stress and depression, which is what litterally KILLS us is it not? If we didn't have technology and everything do you think there would be sickness, viruses etc? It's like those pictures where you see nothing but BEAUTIFUL huge land, filled with life. These days you look at a picture and its ugly tall buildings that are poluting this beautiful world we are taking so much advantage of. Don't you think the things we don't need should be destroyed?