War resulted in famine my ass.
https://en.m.wikipedia.org/wiki/Soviet_famine_of_1930%E2%80%931933
And famine is just the start. If you think any government is competent enough to handle the orchestration of a system is large and complicated as a modern economy you are hilariously mistaken.
I wouldn't even know where to start. Basically every single item in your house runs through some sort of supply chain that would get fucked up if we tried to manage them all through some central planned economy.