This is provably false though, I've worked in jobs where entire large teams never talked to non-technical people.

What you maybe meant is that you always talk to people less technical than you, which is true, but that is a very different statement. For example, when I worked on developer tooling at Google the stakeholders were all developers, the director was a developer, the directors for the orgs we worked with were developers, the product managers were former developers etc. There was just no non-technical people in sight. But you still need to talk to people who are less technical than you, that is still true, but it isn't true that all jobs needs to be able to talk to non-technical people.

I think many misses all the people who work in the background because you don't see or talk to them, but they still exist.