Yes, I had that discussion with the DOT hazardous materials expert. They started by telling me that anything that was flammable was prohibited.
I pointed out that cargo pallets are made out of wood, which is OK, but wood intended as fuel is not OK. So, take your wood fire starter sticks and mark them "cargo pallet material."
Denatured alcohol is obviously not drinkable, so it must be a fuel, so it is not OK. But high-proof drinking alcohol is drinkable, so it must not be a fuel, so a limited amount is OK in checked baggage.
I pointed out that wax was flammable, yet they said that wax was allowed.
I won't tell you where I saw this, but... some cubes of Esbit fuel were taken and covered in colorful wax so that they look like candies. Those were packed into a package that had candies in it originally. That was carried-on successfully. Then at the destination, the colorful cubes were burned for cooking purposes, wax and all.
I think they must have a lot of lawyers there thinking up this stuff.