It took me a while to understand it, but the beauty of it is that when it fails, lot of things fail.

Almost no one gets mad if your site and half the internet were down.

Sure, but that is also a giant weakness. Say in a future conflict with Russia or China, or hell, even North Korea.

They'd only have to take down a few services to completely cripple the West - the exact case ARPANET was designed to prevent.