As I said earlier, economists have a place. He was great as a Finance Minister and RBI Governor. But the moment he became a policy decision maker (rather than just a policy maker) he failed miserably. Do you understand this basic difference? This is the reason I say that economists cannot take policy decisions. They can make the right policies if they are dictated by someone higher up the chain but are incapable to take the same decisions if they are given a chance.
The evidence for that is the GST reform. GST was the brainchild of Manmohan Singh and his Planning Commission when he was the Prime Minister for 10 years. But he failed to get the damn reform passed in the Indian Parliament mainly because he did not know or understand political maneuvering. How is it that the same GST reform, which was Manmohan's brainchild, passed by Narendra Modi (who is his opponent) without any troubles?