It seems to me that the specific gravity of a watermelon will be pretty close everywhere, but the developers of it have to live in a celestial object with a lower gravity or have almost waterless watermelons. The rigidity of the metal used is not strong enough to remove the disc without breaking or crushing it. The lack of a grippy surface inside means you can't really pick it up. Of course, this would also make the "slice" look less clean, but it generally doesn't work well. In addition, it is not well suited for large melons. Slicing a large melon requires very unnatural dynamic positioning of the device and your hands throughout the slicing process. Immediately again with a knife.
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