I wish the FATAL challenge to mainstream economics was the proud ignorance of its own history and what even is heterodox economics. Might have something to do with politics, but who knows 🤭
The fatal challenge to heterodox economics is that there isn't actually orthodox economics.
Just take a few recent Nobels: behavioral, information failure, institutions, bubbles, financial fragility, labor monopsony (sort of), Schumpeterian creative destruction, etc.
Not to mention RCTs which are emblematic of how much economic research is empirical and only lightly if at all structural.
The real difference is methods. Heterodox economics is an avowedly political project not a social scientific effort to better understand the world. And I have nothing against political projects just shouldn't confuse the two.