It’s foolish to be completely dependent on anyone else, no matter how stable the CURRENT situation is. We’ve seen this with the gulf countries and Strait of Hormuz, China with rare earth metals, Ukraine with grains, etc. Once China goes to take Taiwan all bets are off…
Your example are somewhat funny (in a not-so-funny way), the most obvious example for "foolish to be completely dependent on anyone else, no matter how stable the CURRENT situation is" is the US, from a european perspective