When you understand the primacy and importance of the development of the productive forces, and the role that capital in itself has in revolutionizing society, you're able to adopt the proficiency of the Capitalist while shedding his narrow limits.
When a Capitalist employs capital he does so with primary concern for his individual being or interests. The advancement of the productive forces is an incidental byproduct of his activity. He uncovers all of these new ways of managing his businesses for the sake of efficiency.
But his limit is reached in the monopolistic stage, when there's no drive to improve or update, and there's more of a reason to hold back the development of others or employ regressive means of production and management because it saves on costs and there's no competition to spurn you forward.
The principle contradiction of capitalism is thus achieved. The overwhelming majority of society's labor is operated socially yet the fruits of labor is held in private hands, directed in private hands, and owned by private hands - society's elite minority acting as private citizens with 0 social obligations.
Thus the capitalist and the system of capital became a retarding, retrogressive force, a fetter on the world.
The Communist on the other hand recognizes two truths: the potency of the proper management of capital to advance the productive forces, and the necessary resonance between social relations and the productive forces.
Whereas the Capitalist wishes to halt the wheel of progress for fear of losing his social position, the Communist not only wishes for the wheel to move forwards regardless of the sacrifice, but to accelerate that wheel.
Instead of capital and scientific management of the workplace being employed for capital's own sake - profits for profit's own sake, the Communist will employ capital and scientific management for social need, for the common good, for society's sake.
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