That's why it's called "terminal" velocity - the speed at which the sudden stop is fatal....120mph or so is plenty. What's really amazing is the few cases where someone has landed just right in a bog or some other environment and lived.
Terminal velocity: for a falling object, the speed at which air resistance begins to exceed the force of gravity, so it stops accelerating. For a human being I think it’s about 160 mph—more than fast enough to kill. For a cannon ball it’s a lot higher. However, you’re right: there have been rare cases when people survived long falls—by finding ways to decrease their terminal velocity. So there are some potential benefits.