A lot of people regard it as a solved problem. (Stick it in in an index fund?).
Obviously you'd never advise someone to put all their eggs in one basket, but in this case, you're comparing identical baskets - and one of them as a hole in the bottom.
Aren't hedge funds often thematically a form of insurance? If I had a million, I'd probably put 80% in index funds, 10% in hedge funds that were shorting companies that would be negatively affected by global warming, 10% in hedge funds that were betting on another recession.
How is buying 3000+ of the worlds largest companies "putting eggs in the same basket"? Buying some bonds and real estate funds can be nice as well but the diversification benefits are usually overstated. Worldwide stocks are already incredibly diversified.
Obviously you'd never advise someone to put all their eggs in one basket, but in this case, you're comparing identical baskets - and one of them as a hole in the bottom.