In the 19th century, the number and proportion of intellectuals capable of fulfilling the role of cadres was extremely small, leading to a deep tendency towards the fusion of workers' organizations, in order to rationalize a reduced human resource. So think: reformists and revolutionaries, anarchists and communists, Marxists and non-Marxists were accepted in the same party.
In the 20th century, the number and proportion of intellectuals in workers 'organizations increased drastically, beyond the real needs of organizations. Intellectuals competed for leadership which led to: 1) splits, decreasing the efficiency and unity of workers 'organizations, which requires relatively more cadres; 2) a reorientation of the objectives of workers' organizations towards the interests of these intellectuals 3) the mediocrity of the cadres.
Why mediocrity? Given the number of executives, the scope of each executive is reduced, competition and rivalry are fierce, no executive can fully works. On the contrary, as soon as he develops, he will be severely repressed by others to whom he risks taking the place. Selection, nepotism, servility, cronyism become the best qualities to avoid being expelled and go up in hierarchy.
The organization of the proletariat disintegrates, and each fragment becomes weaker and weaker.