I believe in equality of opportunity, not outcome. So, I'm absolutely fine with paying higher taxes if that money gets ear-marked for single payer healthcare, education, infrastructure, etc. See the nordics for an example.
I don't believe doing that would require making millionaires as rare as billionaires are today. The nordic countries have plenty of millionaires and billionaires, yet everyone has most of their basic needs taken care of and most everyone has the opportunity to make something of themselves.
Something I suspect we both believe in is that allocation of resources ought to be roughly proportional to value provided.
Where I suspect we differ is that I don’t believe that market value of services is an especially accurate measure of true value provided. And in particular I think it would be pretty much impossible for someone to provide enough value to society (relative to the average person with a normal job - many of which IMO provide huge value to society for little compensation) to warrant billionaire level wealth. I therefore think we ought to correct this discrepancy.
I don't believe doing that would require making millionaires as rare as billionaires are today. The nordic countries have plenty of millionaires and billionaires, yet everyone has most of their basic needs taken care of and most everyone has the opportunity to make something of themselves.