Because it deliberately fudges things around to imply that getting off crisis-prone gold standard was the actual reason things changed, instead of other policy decisions

Money used to be based on a beautiful thing (positive value), and now it's based on debt (negative value). I'm no economist, but that seems self-evidently bad to me.

The former is not really true - it was still really debt based, use of precious metals is more a very early anti-counterfeiting trick and a way to do emergency exchange of currencies if you can melt the coins and haggle on raw metal.

It is full of negatives otherwise, just romanticised