heart surgery is very complex and success depends on a lot of things. How a human body will react to a highly invasive procedure is unknown hence if it reacts in a way that your average surgeon has no idea on how to deal with the patient would die. Have you heard of specialists? Do you know why people go to specialists? Why is there a need of specialists if every average heart surgeon can do heart surgery?

So you see there is something like a 10X heart surgeon, he/she is called a specialist.