Not tax penalizing non-capital income is sort of an essential reform in the era of increasing automation anyway; I'm not sure what point you are trying to make there. The average middle income family isn't making a substantial share of their income in forms taxed as long-term capital gains, so that seems...unrelated to the focus of your argument.
> I'm critical of the US system, but I have exactly the opposite diagnosis you do: my concern with the system is that, by the numbers, it appears to function by driving way too much spending on "actual" care.
It does both (particularly, in the “actual care” angle, as regards low-benefit, high-cost measures near the end of life.) We have a system based on denying and economically incentivizing younger people to avoid and defer care, but then doing much less of that with (most of) the elderly.