Kubernetes is clearly a different sort of program compared to Microsoft Word. Even if we don't have a rigorous ontology that sorts them into two distinct boxes

Kubernetes is clearly a different sort of program compared to Microsoft Word. Even if we don't have a rigorous ontology that sorts them into two distinct boxes neatly, they're just so different at the extremes that it's useful. We make a distinction between pulmonologists and cardiologists even though they both know anatomy and deal with the human body, and as we mature as a discipline, specialization is only natural. Denoting the area someone works in as belonging to one group or another is useful for determining peers that share your concerns, vs people that work in totally different areas from you. That doesn't make them better or worse than you, just different.