Why were tanks unsuccessful war machines in world war 2?

Tanks were not universally unsuccessful in World War II; in fact, they played a crucial role in many battles. However, their effectiveness was often hindered by factors such as mechanical reliability issues, vulnerability to anti-tank weapons, and the challenges of coordinating armored units with infantry and air support. Additionally, early tanks were sometimes under-equipped or poorly designed for the diverse conditions of warfare, leading to tactical limitations in various contexts. Overall, while tanks were pivotal in certain campaigns, their limitations often affected their overall impact in the war.