"Why is this a problem, as long as everyone is not worse off?". Well actually for a large number of people it is getting worse. Here is data on middle class losing ground: http://www.pewsocialtrends.org/2015/12/09/the-american-middl...

Here is data on life expediencies: http://www.npr.org/sections/health-shots/2016/12/08/50466760...