What the author mentions about sales reps having to listen more than they speak is the most important point in the whole piece IMO.
I think that's the precise reason why founders doing sales can increase success so dramatically. Because they want to improve their product, they tend to listen more. Therefore, they build better products, solve problems with more accuracy, and, consequently, sell more.
There is also communication overhead as there are many roles wrapped into one in a founder but if a seperate sales person, seperate customer success etc. they need to talk but they may not fully understand everything each other knows.
So this is something we're massively focused on at our startup (Comtura.ai) we integrate with Gong or can support teams/zoom/google meets to collect the transcript than allow it to update their CRM so they can focus on helping the customer / writing better notes to solve for problems with more accuracy & collect detailed product info (and ergo, consequently sell more).
I think that's the precise reason why founders doing sales can increase success so dramatically. Because they want to improve their product, they tend to listen more. Therefore, they build better products, solve problems with more accuracy, and, consequently, sell more.