left-wing populism, which argues for reigning in the excesses of capitalism
Left wing means ending Capitalism, not just “reigning it in,” which never works long-term.
“Left-wing,” is a very broad term. In the Weimar Republic, yes, the left-wing alternative to right-wing populism was communism. In America today, Democratic Socialists like Bernie Sanders are the left-wing alternative. If that doesn’t fall in line with your definition of, "left-wing,’ that’s fine, but it most people wouldn’t define it as exclusively anti-capitalist ideologies.
The Overton Window is relative, sure, but that’s only useful in defined constraints, and only for one point in time. Leftism is socialist, rightism is Capitalist.
Bernie is a Social Democrat as well.
…and Sanders himself defines Democratic Socialism as the completion of the New Deal reforms, not a gradual transition to a socialist economic system. There’s a difference between the Overton Window shifting and a gradual change in definition over generations, but if you want definitions to remain entirely static, then we’re both using left-wing incorrectly, as it’s, “real,” definition is opposing monarchy’s veto power over parliament.
