I feel like this should be titled “why NASA should not go to Mars.” I would be astounded if SpaceX makes it there within 5 years of their original timeline, but even more astounded if they don’t have a crew within 10 years. I don’t see procrastinating with bone density studies etc. either - they treat it as a commercial venture, not an exercise in basic research.
There are already a lot of those studies, and they all say that radiation is very bad for you and that you need gravity to maintain a healthy bone density.
Maybe the people going there aren't overly concerned with bone and eye health. Perhaps the goal in life isn't to do everything in one's power to stave off death.
