Social democracy has foundational and practical problems.
Social democracy perpetuates and reinforces capitalism because, by beautifying it , disorientates people from the basic objective of a
classless society through revolution.
Social democracy, since in principle does not require the public ownership of the means of production, cannot be independent, it depends on private capital and so, it cannot solve the fundamental structural problems of capitalism such as the cyclical fluctuations,
exploitation and alienation. source
Social democracy maintains the bourgeoisie that, by utilizing its power , cancels the policies which are in
favor of people , particularly in times of crisis of capitalism. source
Social democracy limits the effectiveness of the capitalistic system.
The competition among countries in the open market to attract investments, forces the social democratic parties to give part of the
labor rights and to succumb to lower taxes and as a result they are converted into parties that work against the majority of people.
The classless society is not an end in itself. If it was possible to have a balance in capitalism , classless society would be unnecessary since it could be considered an utopia after all.