There’s a reason China builds more HSR and subway lines, ships, and solar panels than the rest of the world combined.

That could be because electric rail doesn’t depend on oil that can be cut off. That is a constant threat to China.

if China didn’t mandate bauxite mining operations extract gallium, the mines would never build the required infrastructure

Which is unneeded market distortion. China could also have paid them to build it or guarantee fixed prices.

intervene if the capitalists try to not compete

That’s what the laws against monopolies should do. That they are not as heavily applied as they should shows the major weakness of the West. The answer can’t be to reduce competition further and hand over more control to those corrupted institutions.

Unlike in capitalism where those engineers are selected by the people with the most money.

Which gives the engineers the opportunity to rise money on their own.