I guess the main break from Marxism is: who should seize the means of production?
Obviously oligarchs are the ones it needs to be seized from.
But governments can be run by Donald Trump who will appoint Hoggish Greedly in charge of the EPA.
America is perhaps an early experiment in Democracy that concentrated way too much power in the President, oops.
Co-ops offer a path forward where the means of production can be controlled by those who use it, rather than oligarchs or governments corruptable by the oligarchs. It's distributed rule directly by the very people who consume a resource with deliberately limited scope.