I think it's weird people are stuck on treating the real-world system of capitalism and ideals about how markets should work as synonymous. It's possible to criticize capitalism for its failures without necessarily questioning the underlying ideals about markets. They're not the same thing. Markets and market-thinking predate capitalism, and exist in and affect all kinds of non-capitalist systems, today and historically. They aren't solely a feature of capitalism, and capitalism isn't the same thing as markets.