For me happiness is an incredibly flawed metric. It's so obtuse that it's context is the only thing of value to discuss. I.e. that article for me is discussing financial well-being.

For nearly two years I've split happiness into 3 pillars: .Mental well-being .Physical well-being .Social well-being

A truly happy day is a stars aligning event where each category has to be fulfilled.

But you get a lot more nuance in knowing your emotional happiness is not occurring with equally strong physical or social happiness.