$0 just feels like a concept -- I can imagine a really high quality structuring exercise that gets tax low by making sure leverage on capital is what's used for spending, but I'd be really surprised to see a 0.1%-er (or 0.001%-er) post $0 income tax. For one, it's disadvantageous for certain kinds of bank interactions. But also, capital calls come in, investments that are made often require a step-up in basis, leverage is taken out on assets that require a margin call or a sale, there are alternative tax regimes, the corporations that are owned by these parties have their own tax burdens..

To say the wealthy can afford to radically optimize taxes and that our system taxes capital much more lightly than labor seems accurate to me, but I just haven't seen offers for "pay zero tax for all your life" from high grade professionals.

If US citizens want that, they generally give up their citizenship, pay their exit tax, and live in a low tax jurisdiction. I do know people like this, and they are very unlike the 0.1% types you're referring to here, and they've given up the benefits of being a US citizen in exchange for their preferred lifestyle. (And paid a mark to market exit tax on all assets on their way out of the country)