I understand the core ideas, but different attempts to implement will differ in the finer details. I can approximate the communist response, but there's a wealth of literature and thought on the subject that I haven't explored. I read the Communist Manifesto to understand the basic tenets, and that's it.

I think you could produce and sell goods, but some implementations of a communist state may differ.

As for disrupting infrastructure, I'll give an example. Let's say we develop nice, fast 3D printers that can print metal in a durable way. Say there's some widget used in future tech that can only be 3D printed and must be made of metal for some reason. Under a communist state, if production capacity wasn't meeting the needs of the people, the government would have the authority to confiscate capable printers and reallocate them to production of those critical goods. It should be noted, however, that most hobbyist printers *today* wouldn't be fast enough to be worth confiscating even if they could work with the right materials, but even if that changes, it won't change the fact that there's often a huge difference between a tool for an end user and a tool for mass production, and communism is primarily concerned with the latter, not the former.