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There are many parts on a ship of that size which need power and are critical for safety. That is not comparable to leisure craft.

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Thank you for your insight. Hard to believe nobody else thought of it before.

Whilst basic, its a critical and valid point. It is being made on a forum where shipping, ships, and related engineering issues are not well known (at all).

It does lead to questions about how backup and failover power work on large ships. Secondary generation? Central batteries? Per device battery failover?

Batteries, yes. And there's an emergency generator that runs on diesel (big ships run on "bunker oil") which can be started with batteries or manually.

https://www.youtube.com/shorts/_Y2VNS5TFFY (this one with a hydraulic hand pump)

https://marineengineeringonline.com/emergency-generator-on-s...

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