Most common
The write-up describes a category, not a solution
"An AI-powered platform for farmers" tells a judge nothing. Which farmers, which decision, which data, what does the model actually predict? Specificity is the single cheapest way to raise your score.
Kills novelty
It already exists and you didn't say why yours differs
Judges have seen forty crop-disease detectors. If yours works offline, or on a ₹500 device, or on a crop nobody covers — lead with that. If you can't name the difference, you have a positioning problem, not a writing problem.
Kills depth
Every hard part is hidden behind an API
Calling a vision API is not computer vision. Judges look for the part you actually engineered — the sync protocol, the edge deployment, the data pipeline, the constraint you designed around. Name it explicitly.
Kills feasibility
It cannot be built in 36 hours
A national-scale integrated platform is not a hackathon deliverable. Scope to a prototype that demonstrates the hard part, and say what the prototype proves. Ambition in the vision, realism in the build.