Yes, you, too, can have two-thousand-year-old buildings if you're willing to make that longevity be the primary thing you pay for, assuming that your successors don't tear the thing down and replace it with something else, like happened to many Roman monuments.

In which case you spent a bunch more than you needed to on a building that didn't last any longer than it would have if you'd chosen a practical end date for it.

Efficiency is never worthless in a world where resources (if nothing else, labor) are not infinite.