• But, like, cats wear out by use, not time. (For the most part.)

    A car is good for, say, 300,000 km. If you drive 300K in it, then you “fully used” the car.

    That’s like saying a pad of paper isn’t used when it’s sitting on your shelf. Technically true, maybe, but the pad is used up when it’s out of sheets. It doesn’t make sense to measure the utilization time for a consumable, like paper or a car.