Aren't these tools just for junior network engineers, not gurus?

Should a network guru be making routine move/add/change config changes by hand, or would they better spend their time on bigger issues? Most likely, they're going to tell junior network admins how to make those changes, and then hope the juniors do it correctly and consistently. Netomata's tools give network gurus a way to ensure that the correct configs (all of them, for all the various devices and services that you've templated for your network) are generated, rather than hoping the juniors do it perfectly when they do it by hand. It means fewer opportunities for mistakes in the handoff from guru to operating staff, and better leveraging of the guru's time and expertise (by working on architectural issues, and reflecting that expertise into templates).