Yeah there’s always a difference between how the world actually works and how each of us think it should work. The advice here is for the reality-based contingent who want to minimize their tax obligation. For the rest there’s Cryptoland.
When Cryptoland or some other libertarian fantasy country actually exists and issues usable passports. Until that happens, most likely never, US citizenship is not terrible.
Renouncing citizenship requires finding another country that will give you citizenship, preferably a country with a strong passport and lower taxes than the US. That option really only makes sense for the wealthy.