Indeed.
Buffett avoids agency risk by dominantly buying
entire companies, or taking out huge stakes in the companies that are too large for them to buy - so that investors can only take part in the gains by buying BRK.A or BRK.B:
- either the shares are not public at all,
- or Buffett's stake is so large that:
- the investor would risk a big drop in the price if Buffett reduces his stake, which he'll do in secret,
- the investor would also miss out on the initial increase in the share price when Berkshire Hathaway invests in a company.
Buffett also primarily buys discounted cash flow from undervalued rent seeking companies under temporary distress, not innovators like ARK. I think Cathie, Tasha and the other ARK analysts would bore themselves to death if all they did was to search out and patiently acquire discounted monopolies.
Btw., I half expected Buffett to buy a big chunk of TSLA when it dropped below $200 - it's the obvious next big quasi-monopoly and he owns other EV stakes, but he didn't.