One-Page Pitch Pitfalls: Beyond the Typos, What's the Real Deal-Breaker?

Hey everyone, Darius Pope here, Best Boy Electric. Been working on a short doc I'm trying to get off the ground, a slice-of-life look at late-night diners, the people who work there, and their regulars. I've been wrestling with this one-page pitch document, trying to condense everything, and honestly, it's tougher than running a 400-amp distro on location. I've read all the advice about clarity, conciseness, and market appeal. I'm focusing on the heart of the story, not just the technical stuff.

My question is this: forgetting the obvious stuff like grammar mistakes or bad formatting, what's one conceptual error you consistently see emerging filmmakers make on their one-page pitches that instantly makes a project seem less viable? What's the underlying flaw that truly undermines it, even if the premise sounds decent? I'm trying to avoid that exact misstep on my own document.