It is the prerogative of the “C-level executives” to maximize the rate of exploitation on behalf of the bourgeoisie. When the working class eventually takes power from the bourgeoisie, that prerogative becomes obsolete (and so do those parasitic executives). Instead of utilizing improvements in productivity to increase the wealth going to the bourgeoisie, they can instead be used to improve the well-being of the working class.
So, if it turns out that we really need more tires, or whatever fits your analogy, then we’ll just make more tires. However, the wealth that would have been syphoned off to the idle owner class and their lackeys will instead stay under the control of the workers. Therefore, as the revolution progresses, the workers will gain more and more time, energy, and opportunity for individual and communal fulfillment.