Survivorship bias. The ancient stuff that survived to the modern day are not more durable than contemporary engineering, they’re just the 0.1% of structures that managed to survive this long.
The problem isn’t that we can’t build something that will last a millennium, it’s that we rarely, if ever, need things to last that long. Nuclear waste storage facilities are the only thing that comes to mind. Everything else would need to be torn down and renovated or brought up to code at some point.
I bought like a $30 one at the grocery store a few years ago and it’s still going strong. If I forget to use it for a long time it’ll get a patina of rust, but it scrapes right off. I only seasoned it once when I got it with beef tallow.
Honestly if I threw it away today and bought a new one it still would have been cheaper than buying a Teflon pan for like triple the price and having it only last maybe a year before it gets completely ruined, and you get those forever chemicals in your body as an added bonus.
It’s not like it’s some huge investment, just give it a try and see if it works for you. Buy a cheap one at a big box store, season it with oil or fat, and don’t put it in the dishwasher just hand rinse it with lye-free dish soap and a soft sponge. Maybe that’s too much work for you and you prefer your nonstick or stainless, that’s fine too, good quality stainless can last a lifetime if treated properly and ceramic nonstick pans are getting better and cheaper all the time and pretty much outcompeting PFA-based products because people are becoming more aware of how shitty they actually are.