One of the strongest levers we have to improve the “inputs” you’re describing is a better primary care system. America’s has been absolutely gutted over the last 20 years by interactions of various economic and regulatory dynamics including (notably) the anti-competitive vertical integration of pay-viders and pay-vider+PBMs like UnitedHealth Group.
It is absolutely not true there aren’t system-level changes we can make in healthcare and insurance to help address this.