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Single points of failure are easier to reduce after drawing the dependency chain. Backups, redundancy and manual fallbacks solve different problems, and expensive duplication only makes sense where failure consequences justify it.
A useful automation kill switch is independent of the automation itself and defines two things separately: how to stop new work and how to stop work already in progress.
Dead Internet Theory: Price increases and reliability problems should be compared with actual service data rather than frustration during one outage. Microsoft 365 provides a useful case because Microsoft publishes both commercial pricing changes and quarterly worldwide uptime figures.