This is overly simplistic. There is little to debate about your example of living at a 7/8 for 2 months. What is more realistic is some hypothetical situation where the average patient has an expected survival of 6 to 18 months, with the hope that the 7/8 pain can be reduced to a 4/5, and with acknowledgement that some days may be a score of 5, some days may be a score of 9. Then what?
As a provider on the other side of it you witness two similar patients take two different paths. Perhaps the first patient lives 36 months with pain score averaging a 3. The family will often appreciate the intervention and effort. The other patient experiences a string of complications and dies after 2 weeks, living at a pain score of 10. Their family paints you as an evil torturer who should have never been listened to.
In fact you can see both types of opinions in this very thread.