If the old concrete lasted only 2X as long (instead of 100sX as long) that would apply.

The answer is it's cheaper upfront.

In a money system that puts MORE value on doing things cheap upfront instead of building for the future, this is what you get.

When you look back in history, the best art and architecture was done/built during HARD MONEY times - when money had value.

We are headed back to those times once the US$ system fails and we go back to Gold, but ultimately we will end up on a #Bitcoin standard driving time preference to zero - meaning we will build everything for the future to last as long as technically possible.

We will also make decisions to do something based on future value - instead of as cheap as possible upfront to get by at the expense of the future. If you study history, this all becomes very clear over 1000s of years.