More on Palma index

The concenusus seems to be that extreme inequality is bad. Palma index is one measure of it. Here are some thoughts by Joseph Stieglitz on it: Measuring Inequality: Comments on "Do nations get the inequality they deserve? The 'Palma Raio' reexamined' by Jose Gabriel Palma https://www8.gsb.columbia.edu/faculty/jstiglitz/sites/jstiglitz/files/MeasuringIncomeInequality.pdf
Branko Milanovic is not too enthusiastic about Palma index
http://glineq.blogspot.com.au/2015/06/why-i-am-still-not-excited-by-palma.html