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A breaker panel isn't just used for overcurrent protection, though—it's also a standard point to disconnect power when needed. The possibility of house wiring being energized even when all power to the house is cut is dangerous for anyone not familiar with the setup. This could be lethal if work needs to be done on it and OP isn't around to explain how it's wired up.

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True, but signs that there is more than on disconnect are common in industrial settings. They are rare in house situations, but putting a sign on the main breaker box is probably enough to meet code. Though it would surprise the inspector.

This is common in home systems where you have a second power source like solar. Mine has markings like this: https://www.jadelearning.com/blog/pv-system-marking-and-labe...

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