[Flyndaran]

That requires doesn't need to eat mean cannot eat under any circumstances. I don't think everyone interprets the advantage that way.

For my robot example, I tend to think of what circumstances could make him panic for lack of resources. Food/water AND/Or electricity is obviously an advantage even though it's one default zero point feature plus a disadvantage.

The Restricted Diet is weird because it is not just a disadvantage but also an advantage as it effectively eliminates the default human food/drink requirement for forms like electricity, radioactives, etc.