I agree with this. I think the point that's often missed about taxing the ultra-wealthy is it incentivizes them to work through people more instead of doing it all themselves. This is a good incentive.

E.g., if I have no noticeable tax on my wealth as I create impact for the world through my companies I'm going to keep being the one person in charge of that (to achieve my mission of reaching mars, etc.). But if I'm going to get nicked (to the tune of billions of dollars even at 2% etc), on average I'm going to redeploy my assets via people I trust in the company etc. I might even invest more in public welfare projects. It is fair arguably that there is this forcing function because one's value accrues from those projects originally. So there is an elegant symmetry at the end too.

It would be unfair to tax billionaires more if they truly worked in a vacuum and provided value to the economy through very few dependencies. But that's never the case. And right now too much excess is spent on things like these sport teams via inherited wealth etc.