The NHS should only provide essential operations. But I would class hip and eye operations as essential, after all, walking and seeing is quite important to most people!
This idea of leaving such problems until they are acute, seems rather strange to me, surely if you have to fix something anyway, sooner is better than later.
This reminds me of a work colleague who lost a leg in a car crash and the insurance company sent him to one leg specialist, after another, delaying compensation payment.
We suspected they were hoping it would grow back.