My vision of state socialism is a slow transition away from antagonistic capitalism, through welfare capitalism, to straight welfare without capitalism.
The idea is that once human labor no longer has livable value in the current system; when robotics, AI, and 3D printing have made everything from street cleaning, to farming, to manufacturing, to database management, etc no longer requiring any human labor beyond the engineers who maintain the systems (depending or not if the robotic systems can self-improve at that point yet). Capitalism becomes untenable. Goods and services should theoretically become cheaper, but most people still won't be able to afford anything. The first step is fair taxation of companies and the rich to pay for a universal basic income, free universal healthcare, and free higher education. Over several years to decades, various industries are nationalized by the government. Starting with the most essential, healthcare and utilities. Followed by manufacturing and services until the "corporation" is dead.
By this point no one should be employed, no one should be a wage slave any longer. AI ran resource management prevents a scarcity of food. The millions of acres once used to produce ethanol now makes food in a post-oil world. Automated space mining brings near unlimited rare earth elements and other resources to Earth. People simply order the food, the clothes, the material they need, or their home AI orders it for them and it's automatically delivered for free.
Housing will be a sticking point at first, everyone wants to live on the beach. Expansive high rises will take over the majority of housing as people migrate towards the cities again as they are no longer prohibitively expensive. People are giving housing based on need, a family of four will get a four bedroom home for free for example while a single person could get a studio or a one bedroom.
No one is forced to give up anything they own, except on strictly regulated instances of eminent domain like today. A family farm can stay in the family, they can even tend to it manually of they choose.
A barter system will evolve, wherein while labor in the traditional sense has no value, creativity and special skills will. Want a handcarved centerpiece for your dining room table? Maybe trade the craftsman something you made for it. Maybe the craftsman gives it away for free because the materials cost him nothing and he got enjoyment from its creation.
People are free to pursue their passions without the burden of survival on their shoulders. General happiness increases and people become naturally more egalitarian and calmer.