You know, what's funny is that we'll never be sure if that's the case[0]. What guarantee is there that the median socialist voter wouldn't vote for more work for everyone because they want fancier tvs, or more dazzling musical spectacles, or fancier video games, bigger homes, etc? What if society doesn't democratically vote for idleness and quality of life / tranquility?
[0] I mean unless there's a real and successful socialist revolution.