You could see it in the history of countries that went through a socialist phase (such as Russia): it works, until it doesn't.
As soon as there is no personal incentive (or real ability) to improve things, the tech sector starts to stagnate and fall behind the rest of the world.
The hypothetical case was zero human input, self sustaining factories that rely on renewable energy. In that hypothetical case... How could nationalizing screw it up since there is no human or non-renewable input required? I guess they can "overuse it" so we all become Eloi but we're on the way there anyway.
This implies having all the necessary factories for all things, to begin with. Which seems utopic to begin with, right?
With renewable energy, etc, the country shouldn't fall apart like USSR did, but it is almost certain to fall prey to more entrepreneurial/militaristic neighbors, sooner or later.
As soon as there is no personal incentive (or real ability) to improve things, the tech sector starts to stagnate and fall behind the rest of the world.