It’s also important to understand that “Marxism” means different things in a peasant farmer context than it does in an industrial context. It’s been extended to places and contexts and it’s not always appropriate to do that. But the framework of understanding class was definitely necessary and I think is still appropriate.

Keynes and Friedman are also required reading for understanding economies. And philosophy. Socrates was wrong about everything but we still read his works because they were influential and shaped history. “Philosophy” writ large is ultimately physics (like everything) but no one person can understand everything so we focus and stay humble.