I agree with this assessment. The copy is a little to generalized. Just by adding the word Startup to your headline, a reader would get a better understanding about what you do. Personally, I would drop the phrase Artificial Intelligence from the headline. I don't think it's necessary. Instead you should put the benefits you listed in its place. "Create the Perfect Startup Pitch in Minutes - Fast and Stress Free"
I think the idea is interesting. I, like you, have found that planning and structuring your prompts give way better results; particularly using structured outputs.