"On the cs bit. This is major surgery"
Any operation within or upon the contents of the abdominal, pelvic, cranial or thoracic cavities is called a "major surgery". It's a medical term, not an alarmist one.
CS is the most commonly performed major surgery, with risks and recovery much closer to a tonsillectomy than heart surgery.
"with well documented risks to mother and baby"
So does vaginal birth. If you don't know about them, some of us on this thread can give you detailed information. (You might like to give this a miss if you ever want to sleep again)