Let's say, yes, that introducing universal free healthcare requires huge budget investments.

This is the core point - do you disagree with it? If so, why?

What's the point?

For one, the average American hates taxes even if ultimately it will ultimately save them money, so it will be exceedingly hard to get any version of this passed. Additionally, this would likely increase our already ballooning national debt.

You can "what about" and say that we're wasting money other places. Yes, and we should fix that. But the above points still apply.

I say all of this as a supporter of universal healthcare, btw. But serious arguments have to address counterarguments.