Marx focused too much on class stratification. His ideas for a communistic state were too entwined to the concept of state-like entities, enough for authoritarians to bastardize his works and still claim ideological purity. It is possible that in the future, society will have evolved past needs and desires for material goods such that an individual can work and better oneself as one sees fit.
But now is not that time.
But now is not that time.