Planned economies are actually very efficient, look inside of Walmart and Amazon, and what you'll see is a ton of planning, this planning isn't based on 'a handful of planners', but instead based on a fuckton of data, usually collected and analysed via SAP business planning software. These companies are able to respond to trends and price goods in a way that their profits remain high, and both of these companies at least have some of their supply chains under full control for themselves.

I'm pretty sure we can create this kind of planning and enact control over it for different goals apart from profit, and there are countries where this is already being tried like here