You're not wrong. What's interesting is that the people who are most exposed to the realities of extreme interventions in health care, physicians, are the least likely to opt for them. A lot of doctors who get stage 3 or 4 cancer late in life just take some painkillers and retire to their homes for the end. They don't do dramatic surgeries and ICU support and aggressive rounds of chemotherapy.
They've seen what that's like every day, and unless they have a real chance of being able to actually recover and be healthy again, they don't want it.