"What is the point of democracy if there is no democracy at the workplace itself?"

Do you mean this seriously? Corporations come and go all the time, and if they make a catastrophic decision, usually the worst possible outcome is bankruptcy, not war.

Yes, there is a tiny amount of "too big to fail" corporations whose characteristics are closer to a state than to a private organization, but compared to the government, any single corporation has negligible influence on your life.

Modern governments have enormous powers.