I have not built such a device. The programming skill is a big first step to understanding the potential applications. Assuming the accuracy shown is replicable, the example joinery and mechanics is invaluable. I have tried making low lash joints with 3d printed parts. This was not an easy problem for me to solve from scratch. From my experience mostly making functional prints and mechanisms, a project with the results claimed here looks like an enormous project with a ton of engineering. It is the kind of thing where I would pick up a lot of design ideas and principles.
Lastly, assuming the final product is durable enough, it changes the time/value balance for repeatable tasks; so anything can become cheap. The first thing that I think of is sawing. With a basic hacksaw blade you can cut through almost anything just by repetitive motion. It becomes possible to cut through almost anything that would be impractical normally due to effort and time. This kind of machine really benefits from getting paired with other machines. It could even be used with a 3d printer to replace build plates or remove prints.