Preventative care also consumes resources. A doctor can only perform 8-10 hours worked / (duration of preventative procedure) preventative procedures per day. The number of doctors is limited. Thus, the number of preventative procedures is limited.

You might be right that the US is currently not at the optimum. Insurance companies try very hard to find a better optimum - they stand to gain millions if they can find it. But that doesn't change the fact that doctor hours are limited.

The OP didn't say that the US had a suboptimal system relative to some other. He merely criticized the fact that medical care is a scarce resource and we can't all have as much as we want.

But how come Scandinavian and many European countries manage do provide it?

Scandinavian and European countries provide unlimited medicine to whoever wants it? That's news to me. Do you have evidence for this?

Also, if Scandinavia and Europe have reached the singularity, and now live in a post-scarcity world, how come they are still poorer than the US? How is it possible that their singularity only works for medicine?

...it has been done in other countries, and it is currently better than here.

Do you have evidence for this? So far, in spite of asking this many times, I see very little that is convincing. All I see are life expectancy gaps comparable to the life expectancy gap between people who eat leafy green vegetables and those who don't, and studies from the WHO that give more weight to inequality of marginal costs than to actual medical care provided.