Because as of yet the means of production aren't public property. So the people who own them get to decide the structure of production and they decided we don't get a say in how they are used.
Do they need to be public property or do they need to be in the hands of those working there? I’d be more inclined towards the latter as in most cases the public as a whole is not going to have an informed or educated perspective on how specific jobs/roles/companies should behave.
No, they are not. The USSR and China (only in theory) had/has public ownership and it is quite different than the workers comtrooling their business.
When the public owns the means of production you open up the likelihood of the state directly oppressing the workers as happened in the USSR and China.
All states oppress people, thats the point of a state. The goal of a socialist state is to oppress the bourgeois. While the workers of USSR and China did and do not have full control over means of production they had significantky more than we do