What is good about anything bad? Only what you learn from it.
Congenital insensitivity to pain and anhydrosis (CIPA) is a condition where a person is incapable of feeling pain- the pain sensing nerves aren't properly wired up into the brain.
On the one hand, wonderful! You'll never have to suffer the effects of physical harm.
On the other hand, you'll never learn the motor control and dexterity needed to interact with potentially dangerous objects, and may go extended periods of time not realizing that, for example, a fractured bone has become infected.
Experiencing anxiety is a primer for the brain to cope and endure difficult situations. Without it, you are essentially setting yourself up for failure when something out of your control happens.