You're examples are, pardon my language, spectacularly bad. Its important to differentiate genuine attempts at solving the problem of central planning v/s populist dreams of utopia. In fact Venezuela was much less central planning and more short term grabbing resources and making the available for free, without any consideration of planning or sustainability whatsoever. The Great Leap Forward was, again, a crazy Utopian plan where it was hoped that China would reach the goal of industrialization, again without any specific ways in which to achieve that.

The Soviet Union and East Germany seem to be the only states which attempted Central Planning genuinely, and from this article and other resources, it seems the problem was simply too complex even then... at that time.

Not to mention that in the USSR and East Germany the process, while the attempts may have been earnest, they were still heavily politicized and often unscientific in their approach. Aside from the lack of computational capacity, there was still a sort of economic Lysenkoism to deal with.

Yes but food for example is a thing markets work great on, there's pricing transparency and it's easy to switch suppliers and shop for better prices. The same cannot be said for healthcare for example where it's pretty clear markets fail precisely because it's nigh impossible to do those things. Central planning works well when markets can't. No one is going to shop for the best emergency room price while having a heart attack, nor can you even get transparent pricing from hospitals; you can't know what you owe until after you've have the services performed because they can't know up front what services you're going to require.