In most cases government employees simply aren't prescient enough to allocate resources efficiently. Like in theory maybe central planning could be more efficient if everything worked correctly, but in practice it never works efficiently at scale. Much of the resources simply end up wasted.
If one looks to "government employees", as individuals, then yes, they aren't prescient enough to allocate resources efficiently. But comparing the free market to government employees is not an apples to apples comparison, because individuals don't allocate resources efficiently either in a free market; the "market" as a whole is what optimizes for efficiency.
And I think there is a distinction in different kinds of efficiency that can be optimized for, not just monetary cost. If we desire clean, paved, safe roads, that can be used by all equally for efficient movement of goods, because we recognize that as a prereq for a strong economy, we can not rely on the free market to deliver that, much less optimize for it. It can be more efficient, in terms of actually delivering the desired goal vs not delivering it at all (or delivering a grossly bastardized version of it) to pool our resources and explicitly work towards making something available rather than hoping that the free market will deliver it.
The free market did not deliver on reducing congestion in New York (in fact, one might say that over the decades, the free market is what made it worse), but the congestion pricing program has, and has resulted in a bunch of valuable/desirable knock-on effects.
I do not think that a centrally planned economy is workable; but collectively being deliberate about building the things we need/want, and taking a longer view, can result in significant efficiencies.
The free market ends up simply wasting resources in its drive to discover where efficiencies lie and how to take advantage of them.
