[_xivi]

> If someone manages to generate a letter that I actually find useful and interesting

But that's inconsistent with the example you put forward. For the email to be interesting a human would need to research and approach every prospect independently, how many emails a day they can do? 5, 10, 20, 100?

It's simply not possible for a human to generate 100,000 personalized email by hand. That's the difference.