What this page doesn't mention is 301 or 302 redirects. I think SEO has made "URLs staying live" more of a normie concern than it was at the time. And WordPress etc ship with inbuilt redirects upon slug rename

So to a large extent this has been mitigated and not using the suggestion here, which is to a priori create a permanent URL ontology upfront

That said eventually neglect, removal, reorgs (or simply websites going offline) still happens... but the way the suggested goal has been advanced due to becoming a business concern and with redirects and CMSes as tech that helps

A classic. This keeps getting more credible as it ages. Now it's been at the same URI for 28 years.

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Great article, lots and lots of past discussion: https://hn.algolia.com/?q=cool+uris

It is not only about "coolness" but long-term preservation too; that was one of the main motives behind DOIs.