Communism is very utopian and it is not well defined about how it would work in a practical or thoeretical sense (AFAIK). It is something to aspire to. Something to guide your path. One day, something like it may be achieved, but will take a long time to get there. Like, say, carbon neutrality, the "pursuit of happiness," the elimination of world hunger, to be like Jesus and to not sin, to have pyramids built, etc. It's a fairly common concept.