Why communism as described by Karl Marx has never developed as he predicted explain?

Communism, as envisioned by Karl Marx, has never fully developed as he predicted due to several factors, including the resilience of capitalism, the complexities of societal structures, and the political realities of power. Marx believed that capitalism would inevitably lead to its own downfall through class struggle and economic crises, but instead, capitalism has adapted and evolved, often incorporating social welfare measures to mitigate class tensions. Additionally, attempts to implement Marxist principles in various countries have often resulted in authoritarian regimes rather than the classless society Marx envisioned. This divergence from his theoretical framework highlights the challenges of applying abstract economic theories to diverse historical and cultural contexts.