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Linkbait title aside, this is a pretty good argument in favour of graceful degradation for scriptless pages. If the JS libraries/cdn/what not you deal with are on a CDN which is down for whatever reason (be it blocked, temporarily offline or "I forgot to pay them"), it's important for your site not to block on the requests and to display the text content your users want in a readable format.

We're not talking "web 3.0 apps" here, we're talking documents - news articles, "Contact Us" pages on a company site, etc.

It's also one of the scarier downsides of centralized CDNs. It's too easy for a single site to get blocked or go down temporarily and suddenly, thousands of websites become unaccessible. And this is not a situation we can keep brushing off for long, there is a real need for decentralized solutions.