Maintaining order and fighting entropy is hard, but also planned obsolescence is a good thing for systemic resilience.
You have to regularly clear out the old for at least two reasons...
a) keep the process of creating new things well exercised. "We can't build that anymore. We don't know how." A factory that builds things that last too long eventually goes out of business.
b) prevent old things from monopolizing resources due to more time to compound interest. Otherwise, you end up with Saturn devouring his son.