It’s very efficient at extracting resources from the environment and working class. It’s more efficient than slavery and feudalism. That doesn’t make it a net benefit for either the planet or the working class.
And plenty of non-Western cultures had economic systems similar to socialism before we colonized them and forced capitalism down their throats. So no, your socialism must follow capitalism equation isn’t real. Sorry.
What Marx meant was if we don’t evolve past Capitalsm, we’re fucked. That’s what he meant by socialism must follow capitalism. It’s a moral must if we want the planet and species to survive. He wasn’t talking about causation.