This doesn't solve anything if the parts you replace are then thrown in the landfill. All you've done is spent a lot of resources and energy to turn around and throw stuff away anyways.
It does matter a lot if the 5% of a product end up in the landfill vs if 100% of it end up at the landfill.
It also matters a lot if one product end up at the landfill after 10 years or if one product end up at the landfill every year, resulting in ten products at the landfill during the same period.
It also matters a lot if one product end up at the landfill after 10 years or if one product end up at the landfill every year, resulting in ten products at the landfill during the same period.