Survivor is not "scripted." It's edited, sure. They take a bunch of video and then they edit it for each week's show, and in that manner, perhaps they can sort of control things by what they put in and what they edit out. But it's nonsense to say that it's scripted.
I agree with Gracie, it's not as rough as the early shows, but I guess when people were getting sores all over their bodies and their hair falling out from malnutrition they decided to tone it down a little. At least now they provide them with a minimal food supply.
And those challenges...they are still tough.