Because providing this information to the consumer would be much easier to implement, face much less resistance and have an arguably greater effect (if there's

Because providing this information to the consumer would be much easier to implement, face much less resistance and have an arguably greater effect (if there's a law saying that every washing machine must last at least 5 years, for example, that doesn't incentivise manufacturers to make something that lasts for 20). Also, to be honest, it just seems "neater" mathematically/economic to not set hard borders anywhere.