You can get a copper roof that is pretty much permanent. The problem is that it will outlast your life and your plans for the house. You won't get to amortize it forever to realize those cost savings.
People don't generally want to enter 50+ year long commitments for physical assets/money.
> Now add on to that interior details, floor coverings, appliances, and such many of which are lucky to last 10 years
Interior stuff pretty much lasts forever if the house is kept at a stable temperature range & humidity. I have 1 nice hardwood door inside my house installed 12 years ago. It looks and works like brand new. You can basically pick things for inside your house that will last forever.
There's a pretty common trend on HN and in general to embellish house upkeep costs. I think it's mostly people who rent doing it, because they have no idea what it actually costs or aren't handy enough to do simple repairs.