The thing is, you don't have to centralize the entire economy in order to be positioned to solve for the difficult problems facing us. But I think having a robust long-term looking economic planning in the sectors everything else rests upon, like energy, natural resources, transportation, logistics, education, care, housing, banking, finance, basic research, defense, food, electronics components, chips etc. itself produces small firms that can do new things much easier due to the availability of materials, equipment, capital and labour at low costs. This doesn't mean that for example every chip made would have to be planned by someone in the capital. Nothing of the short. It means that the planner says, we need to have the designs and ability to mass produce low cost, high performance RISC-V cores for PCB integration by 2025. Then Huawei and SMIC get their shit together and assemble teams to do this. If they need more capital they get it. If there's someone who wants to start working on a design with a new team, there's going to be capital available for a startup. Once the core is in production, that core becomes an input for other large and small firms, or individuals who want to do something with a low cost processor in it that now have a viable path to form new firms. This is why there are a shit ton of small Chinese firms making innovative consumer items. This is why US firms keep explaining how they can't possibly make this or that product in the US in the context of tariffs. When everyone downstream from them is profit maximizing, their inputs become prohibitively expensive. Someone was talking about how much it would cost to source a small neodymium magnet motor for a consumer pump made in the states and said it's so expensive that it's only viable for defense, aerospace and such. And then the neodymium still comes from China.
The consumer parts of the economy where you have smaller firms with interesting products often sits at the tip of the existing supply chains and infrastructure. Perhaps use them differently. That's also true for local breweries as they rarely grow their hops, wheat or build their own equipment from bare metal, or mine the metal.
But even in the consumer sector here (Canada), most of the aisles in our grocery stores are filled by the products of a handful of companies. PepsiCo, Coca-Cola, Unilever, Colgate-Palmolive, Kraft, Nestle, Kellogg's, Danone, Mars, Mondelez and the store brand. Then you have Big Ag product filling the produce and meat section from the usual suspects. Outside of who provides these firms with direction and who collects their profits, they're what state-owned enterprises look like.