I think I understand what you're saying a bit more!

There are still lots of things that need to be figured out for what is often referred to as "atomically precise manufacturing". APM, coined by Eric Drexler, is often focused on the part of the process that assembles from already ready material, and the value propositions that come from that - for example, literally no waste in the manufacturing process, and shapes/structures that would not be possible otherwise.

However, it also requires a process that can break down/recycle objects into those base materials. A unique and separate challenge, but one that has direct symbiosis with the end result.

I'd recommend if you are curious, reading some of Eric Drexler's work. He's really level headed about the topic, and is extremely well versed - he has a blog, last I remember, but also has written great books - I think he coins the term "APM" in that book, it's been almost as decade since I've read it though.