PoW is an expression of value transfer (the expense of one resource to create another). I realize this is a major simplification, but if PoS can't represent some measure of GDP than it's security is irrelevant. It fails the most basic test.
With POW though is a true resource even being create to which the value is being transferred?
Funny thing about so many people in the western world is they perceive their work has to be worth something even when they create nothing of value.