What does it mean for workers to collectively own means of production? Am I supposed to own only the laboratory I work at or everything everywhere? What if I decide to change a place of employment? Why doesn't owning it though the intermediary of the state and your representative in the communist party qualify?
Yes at the end of the day it’s the system of profit seeking and capital accumulation that is the root problem. Even if you abolish the bourgeois class that owns the capital, if shared capital accumulation is still the engine of your economy then you will still have to deal with the contradictions of capitalism.
Individual firms cannot create socialism on their own, they will still have to follow profit incentives unless there is an overlying planned economic system forcing them to follow social ends instead of profit-based ends
This is why co-ops will never lead to socialism on their own, nor will small scale communes.