>And since philanthropic approaches to such aspirations demonstrably do not work, we need extremely high taxes on the ultra wealthy.
Here you're just shoehorning in a specifically ideological posture in the context of a complex situation that's completely irrelevant to your fixation. Government spending today is enormous in the developed countries and among intergovernmental organizations. In the context of existing health research spending there's vastly more than enough money at least available inside government budgets even as they are for increasing that health spending.
Just by reducing several gargantuan military budgets, many governments could easily increase health spending without some arbitrary new punitively huge tax on billionaires. The two things are literally unrelated in cause.
In any case, the revenue you'd generate from this billionaire tax you propose would be much less stable or bountiful than you think or is possible through much less antagonistic alternative means, and this revenue tax from basically forbidding billionaires would probably decrease too, because after all, billionaires, generally being protective of their assets in very sophisticated ways, would find ways to circumvent it. Thus just from a practical standpoint, stable funds for medical research would be much better obtained from reasoned, non-punitive incentives and tax schemes complemented by certain budget cuts for absurd outlays that governments often spend ridiculously wasteful amounts on as is.
>No one intelligent can/has yet looked me in the eye and told me earnestly: anyone with a billion + $ would have a single degree lower quality of life if their wealth was capped at 999 million
No, your hypothetical billioniare wouldn't live any less materially good a life by having just under a full billion dollars, but certain incentives that do also contribute to good things in the economic and developmental world could be destroyed by this prohibition. Also, simply, you might with this tax also badly and pointlessly disincentivize pharmaceutical companies when you could have just tolerated high profits and encouraged them to help with medical generosity in other ways. Remember after all that within health spending, a vast and very useful part of its percentage is sustained by a properly incentivized private sector that it would be stupid to burn just for the sake of cheap anti-capitalist ideological notions.
>If you want empirics google "highest marginal tax rate 1950- present" and "infrastructure spending 1950- present".
Seriously? you're comparing the speed of progress in medical infrastructure and related spending during the 50's with today?
You do realize that part of a reduction in gains could simply be because, oh I don't know, the easier problems and projects having been already handled with older, simpler methods and now the harder problems steadily dominating, requiring much more complex solutions with slower progress and higher cost...