The argument I haven't heard yet.

I am in favor of Universal health care. I have multiple reasons for this. Many of them revolving around the basic concept that healthy people can be productive people. Not all of them will be of course, but they can be.
I am not the picture of health myself. I wear glasses because of a work injury. I can't run or do other types of cardio exercises for extended periods due to asthma, and haven't taken the best care of myself in terms of diet and other forms of exercise. Part of this stems from an early perception that the people who did tend to take good care of themselves tended to treat others poorly and didn't want to find myself associated with that stigma. Early perceptions are often wrong, but their effects last for years.
That being said, I still feel that exercise, and basic health care are things which we should take more seriously than we currently do in our society.
As the health care system evolved here we began to offer health insurance and health care through our insurance as part of our pay packages to employees. Which makes sense as it does reduce the cost in many ways.
However our economy is changing, and what we think of as traditional jobs are not going to be the cultural norm for much longer. Moving to a Universal health care system will allow these non traditional jobs to become viable career paths earlier in an individuals career, and allow a mobility in the workforce that currently does not exist. This will spur innovation and job growth much faster than tax breaks for wealthy individuals or other ideas being bandied about.
This is because innovation does not begin at the top. It begins at the bottom. Successful companies are ones that were able to monetize their founders initial innovations or concepts, and then produce variations on that core concept. However once successful, the founders time is spent away from the environments that inspired their innovation and concepts.
This leaves the task of innovation to those farther and farther down the corporate ladder. However their innovations and ideas can be stifled by the need to hold onto a position in order to obtain the benefits associated with the position such as health care which would be unaffordable to the individual if they were to attempt to form their own business.
The job market is changing, making that transition as smooth and as painlessly as possible will be the difference between the society excelling and the society falling farther and farther behind.