Communism isn't a series of sacrifices for an eventual greater good, Socialism is definitely better than what preceeded Socialism in Russia and China. The idea of True Communism can only be achieved globally, sure, and in the far future, sure, but Communism is about building towards that through gradual improvements.
You're implying that any progress forward is useless if it doesn't immediately achieve a far future society, it's devoid of logic.