Socialism is always about recreating a ruling class: it is to make the working class into the ruling class.

There is no practical alternative to this. Imagine trying the only way: to immediately end class relations. You've won the revolution. Your ideological brethren are in power and the Great Workers' Council is going forward with your plan. How are you going to force people to end class relations? Won't it require a state? Who is enforcing the end of relations? If someone buys up an extra-big plot of land and starts charging tenants rent, reinventing semi-feudal relations, who is going to stop them? And what are you going to do about the bourgeoisie who still exist, especially those overseas, and are working against you to reopen your country for exploitation?

All of these basic realities require a state. And you cannot simply end all class relations instantaneously, as the wider public will not all agree with you ideologically. Unless you plan extreme forms of oppression for the entire population, you will need to deal with the remnants of various class relations in various forms, engaging, ideally, in a process that will whittle them away. That entire process will be recreating a ruling class, i.e. the working class, to impose this process on the other classes.