That is a very start-up-focused analysis and does even mention why a country would want a wealth tax. I would like an analysis that shows how a wealth tax (or a long-running progressive income tax) can keep the (statistical) distribution of income and wealth stable. Sure, we can live in a world where the startup founders (or the Patricians and Equites in Rome) have all the money and the rest beg for food, but that feels like a less-fair world that I don't want to live in. I'd be more interested to know if Paul and others are ok with some economic inequality (as incentive to work), but don't want it to blow up. Or what
BTW, quite a few countries [1] have wealth taxes. Norway, Spain, Argentina, Colombia, Bolivia, and Uruguay [2] are examples.
[1] https://en.wikipedia.org/wiki/Wealth_tax#Example_countries
[2] https://en.wikipedia.org/wiki/Taxation_in_Uruguay