>"I'm sure that a good marxist would love to criticise this by calling it a capitalist's dream of limitless growth."
They're used to being constantly wrong
As for growth not inherently containing meaning or purpose, I am defining those words in the context of a larger system we are a component in. Similarly to how a crankshaft has meaning / purpose only in the context of an engine. If you go up the hierarchy of being far enough eventually you're outside of everything and nothing has meaning or purpose again, not to worry. You just can't get to that point as quickly as nihilists would assume, wherein nothing greater than humanity exists and we're not part of any larger process that will outlast our species.