Usefulness (n.) is not assigned or added on afterwards to things like a jug, an ax, or a pair of shoes. Nor does it float above a thing as an end.
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Usefulness (n.) is a state that Being can 'fall under.' When it does, Being is always the product of a process of making. It is a piece of equipment for something.
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Usefulness (n.) is the basic feature from which this entity regards us, flashes at us and is present, and thus is this entity.
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Usefulness (n.) is the essential consequence of reliability. Usefulness vibrates in reliability and would be nothing without it.
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Usefulness (n.) has no higher form, if one wants to think it, than being saved unto being.