#1 often comes from #2, or at least is much much much easier to do if you have someone who is doing #2.
Technical folks often dramatically underestimate sales for the same reason that sales dramatically underestimates technical folks - they require very different mindsets, and almost everyone is insecure about it on one side or the other.
A CEO who knows a bunch of stuff I don’t know about the domain, who talks to users more than me, and who sits her ass down and researches the hell out of stuff to bring me back useful knowledge—I’m glad to have.