I agree that removing the profit motive changes how the economy is steered, but you are assuming the new drivers will automatically choose harmony. You say socialism will advance production while ending consumerism, but those two things contradict each other. If you are advancing production, you have to consume the output or use it to expand further. Otherwise you are just creating massive waste.

The bigger issue is that you keep treating harmony as a decision we can just make once capital is out of the way. Advancing production requires physical extraction. Planning does not magically make lithium mining or cobalt refining clean. A planned economy still has to dig the same holes in the ground and process the same materials to build the green infrastructure you want. You are just doing the destruction on a schedule instead of for a profit margin.

Historically, planned economies did not decide to be harmonious either. They decided to industrialize rapidly to compete with capitalist countries, and the environment suffered greatly for it. If the primary goal remains advancing the productive forces, the physical impact on the planet remains destructive. Changing who holds the steering wheel does not change the fact that the vehicle is still an industrial machine tearing up the ground beneath it. At some point, you actually have to ease off the gas pedal, not just plan a more efficient route.