But I am pretty sure every economist agrees that a wealth tax doesn't make any sense mathematically
I find it difficult to believe you could come to this conclusion in good faith, given how many serious economists advocate for wealth tax.
This economist wrote an award winning book on the topic https://en.wikipedia.org/wiki/Capital_in_the_Twenty-First_Century, where he advocates for a wealth tax.
He earns 1$ income, the rest is options, his income is below the minimum taxable. The taxes he pays on options aren't income tax.