Funny you say that, because my macroeconomic beliefs are based on Keynes' General Theory, and not some cookie-cutter re-arrangement of the income function that MMT relies on. Moreover, what people learn about Keynes today was co-opted by the old quantity of money theorists of the day, and the neo-classics. They cherry-picked his theories to justify fiscal and monetary policy to affect employment... when he did not argue for that.
But let GAF fall into the mesmerizing utopia of MMT. With the next market collapse, it should be further discredited.