As opposed to gasoline, hydrogen, or methane?

methane/hydrogen/kinda gasoline at least combust into relatively benign substances, what happens when ammonia burns?

The larger problem is when it doesn’t burn. Ammonia is nasty.

Nitrogen compounds, plus a bit of leftover ammonia. All in need of cleaning up.

Yes, those are quite flammable too.

They’re also all inflammable

paper is flammable. highly refined flour is flammable.

gas is combustible aka it explodes.