I think a phone case featuring a slide on camera cover would be beneficial because:
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It makes it simpler for the user to enable/disable the camera module between uses quickly, sliding the cover back and forth is a lot easier than looking for the right switch to flip.
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It reduces wear and tear on the physical camera switch over time.
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It provides protection for the camera module, making it less likely for it to get damaged.
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It adds minimal manufacturing complexity.
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It remains an optional accessory since it would be part of the case, not the phone itself.
Reference Image:

I think a phone case featuring a slide on camera cover would be beneficial because:
It makes it simpler for the user to enable/disable the camera module between uses quickly, sliding the cover back and forth is a lot easier than looking for the right switch to flip.
It reduces wear and tear on the physical camera switch over time.
It provides protection for the camera module, making it less likely for it to get damaged.
It adds minimal manufacturing complexity.
It remains an optional accessory since it would be part of the case, not the phone itself.
Reference Image: