"The fact that they use spreadsheets suggests that they spend very little time worrying about accuracy." I don't get it. Why does the fact that a person uses a

"The fact that they use spreadsheets suggests that they spend very little time worrying about accuracy." I don't get it. Why does the fact that a person uses a particular piece of software suggest that they don't care about accuracy? Does this mean that just because I use R or Python I worry more about accuracy? Really? I think it has more to do with loss of control - real developers hate Excel because it gives business people something they can work with straight away. Every time there's a bug which could remotely be related to spreadsheets, people start another wave of Excel-hate. As if this was entirely impossible in a real programming language. Don't get me wrong, spreadsheets are not perfect by any means. But neither is anything else in this world. It purely comes down to choosing the most suited tool for a given problem. And in Piketty's case there's nothing wrong with choosing Excel.