Having clothes/sandals that don't wear out doesn't prevent you from making new clothes/sandals. To illustrate the point by way of an analogy: if there is a store that sells indestructible clothing, and you buy some for your newborn son, but months later he outgrows his clothes, well, you simply go to the store and buy him some new indestructible clothes again. I do not see where the problem is.
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Clarified that the 'indestructible clothing store' part was meant as an analogy
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