Why on apple support is "Sign in as a SINGLE-USER MODE" a dead link?

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Archived version from 2018, for the curious: Start up your Mac in single-user mode or verbose mode - Apple Support (via Wayback Machine)

Tranzam350 wrote:

Why on apple support is "Sign in as a SINGLE-USER MODE" a dead link?

Because Apple regularly updates documentation and has little interest in archival issues or stable links across time. They regularly edit and delete tech support articles.

So that's the reason why you found that dead link. Whether or not Apple's approach is a good idea is a different question. Personally, I'm not a fan of the practice. You can try to send Apple feedback about your opinion at https://apple.com/feedback/