There's another aspect of the NHS preferring to do "easy" things rather than more difficult ones, made worse by the funding model where trusts/depts etc are paid for the work they do. They love the "bread and butter" work like hip replacements which are pretty routine/easy. That's why people who are very old/infirm with low quality of life often get offered/pressurised into certain types of operation which aren't really appropriate, because it's "easy" money for the trust to fill their slots. They ruined the last few months of my mothers' life by giving her a hip replacement. She already had cancer and was "enjoying" a pretty basic life, managing to do things herself etc., in the knowledge her days were numbered. But her hip replacement really knocked her back, in hospital a week, then really struggled to get back her mobility (she could do more with the damaged hip than during the 2-3 months of recovery with the new one) and then died of the cancer just as she could start getting about herself again. She'd definitely have had a happier/more fulfilling last few months of her life had she not had the hip operation! It's not as if the doctors didn't know she only had months to live due to the cancer, but they massively understated the recuperation/recovery time, making her think it would be a quick and easy thing to have done.
The same hospital basically left my father in law to die one night. He was only in his 60s', generally healthy, etc., but had an undiagnosed bowel blockage - all the symptoms led to that, but the doctors said it wasn't as nothing showed on their scans/tests etc., so he had a few weeks languishing in hospital where different doctors kept coming, doing more tests, but basically he was fading away. He then got an infection, then got pneumonia. We were warned in the evening that he probably wouldn't last the night. The family kicked up a massive fuss, insisted on the on call doctor being summoned, etc., and eventually, they got the message we weren't happy about them abandoning him to die! He was transferred to ICU, and within a few days, he'd got over his infections and pneumonia and was taken into theatre to explore the suspected bowel blockage. They found the blockage, repaired it and he was home within a couple of weeks. He went on to have many years of normal retired life, playing golf, going on holidays. Very hard to believe the NHS were seemingly happy just to ignore him and let him die when he had so much life left in him!
It does seem as if NHS/doctors pick and choose who they want to treat and what treatments to give them!