Buffett likes cash because of its liquidity. That’s also what nationality gives: optionality.
Like cash, citizenship is not just an asset class that returns next to nothing.
It's a call option to exercise your citizen rights anytime you choose.
You might not exercise that option for years, much like idle cash, but you value it for the optionality it gives you.
In both cases, there's a tradeoff—whether it's missing out on higher returns from cash or bearing the cost of acquiring and maintaining a second citizenship—to earn the right, not the obligation, to act.
Optionality is the true value.