How would I improve the following hypothesis? The main socialism subreddit informed me that the original version is horribly naive...

I think the idea that I was trying to go for was arguing for some kind of Nordic model like thing, because strict top-down control with central economic planning, at least according to the history books that I remember learning from, was a total disaster historically

Hypothesis:

Marx had good ideas, but those ideas were partly based on unrealistic assumptions about the conditions necessary to successfully implement a collectivized society. A lot of where collectivized societies screwed up is they conflated collectivism with centralization. Centralized systems are much more fragile than decentralized systems, hence the bread lines and famines.

Conversely, some degree of partial decentralization, such as a federated system, would allow parts of the system to provide feedback to other parts, preventing total chaos, but allow the entire system to remain responsive to external shocks and allow it to survive the failure of one or more parts.