Well, one workaround would be to treat securitization of shares (eg for a loan) as a taxable event. This is a common (and currently legal) tax avoidance strategy. Another consideration is that maybe having sole control of a massive pot of cash or financial instruments by an individual is just a Bad Thing. Consider how Zuckerberg structured FB so that while he it's a public company, the bulk of the stock is non-voting…
I doubt SpaceX or Tesla would exist if they were controlled by a committee. Doing great things usually requires control by a single person who is able to say "screw it, we're going for X".
All companies once they reach a certain size (including Tesla, SpaceX) have a Senior Leadership Team which decides on the critical decisions affecting the company.
This personality obsession is really only perpetuated by people who haven't worked in business and don't realise just how much of a team effort it is.