Wow Arthur, with your logic, it could be said that passenger flights aren’t necessary because we have video calling. It’s too wasteful and dangerous for people to fly. We can just use drones to do all freight transportation.
My take, If we do not have people in space experiencing the unpredictable then we can’t predict what space travel will do to a person or persons. Living in a tent or cave in the dessert with a group of people is just not the same as sharing a low or zero gravity confined space ship.