Warren Buffett is often referring to capital gains tax and the 15% cap on dividends and LT gains. He’s said it should be taxed at the same rate as earned income.
Also, advocating for a progressive tax is NOT advocating for 100% taxation on wages.
The question is whether or not concentrating wealth in fewer hands is a good thing for a society. Show me ONE country that has low/no taxes and is prosperous. I can show you many countries that have high tax rates and have the best healhtcare, life expectancies, literacy rates, lowest poverty rates, etc.
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Life expectancies (if you’re trying to find the U.S., look next to #47):