The perfected, generated, prompted resume is generic and impersonal. It tells me nothing about this person, other than that they use particular tools. I can't see the inputs to their outputs, see what they typed, or the process of building.
The email about why I'm the right person to try your side project says nothing about you. I don't know why you made it, who you are. I don't know your writing style. I don't have any way to connect to you as a person, and no reason to care.