Doing a check up on an apparently healthy person would be wasting time and money looking for something to be wrong. That seems right to me..
What if you went in saying you had chest pain? And what do you do for annual checkups?
If I say I have chest pain, a nurse will assess me and decide if I need to see a doctor. Overall, real, acute emergencies are taken care of quite well.
I don't do annual checkups. They say such checkups are not needed. My employer paid for one at a private doctor when I turned 50. I've heard that if we were more like Canada, that would be illegal.
And I guess they are right. They say our public health care system is excellent.