It's 'strange' because the richest cities were generally also the richest 100 years ago. That meant they were the first to be able to afford it, and used the te

It's 'strange' because the richest cities were generally also the richest 100 years ago. That meant they were the first to be able to afford it, and used the technologies available at the time. And it's simply not worth the cost of gutting a perfectly functional piece of infrastructure because you're jealous that someone else's is nicer.