I'm not sales person myself, but I think it's pretty obvious to spot the difference between a sales person who is actually achieving sales, and one who is not. Perhaps much more legible than arguing whether a Dev team is creating or destroying value by deciding whether to refactor the mess or keep piling up technical debt. Listen to any sales podcast for five minutes, you'll see it's full of people deliberately practising specific skills, and lots of things we would probably characterise as "technical" activities once we have the language to identify and classify such techniques.