I think it less of being an ignored matter and more one of profitability.
There is big money to be made buying 10 million dollar bombs from Raytheon.
There is little money to be made from making thousands of low-tech drones with wood propellers.
Our generals would laugh at anyone offering such a weapon! For one thing, what would we do with them? The US military still feels relatively immune to territorial attack here on our mainland, so our military is primarily designed as an /offensive/ tool. Wood drones are something we might laugh by the hundreds if, say, we were at war with Canada or Mexico and fighting a border skirmish.
Our generals want space-based weapons they can launch from the moon and hit a postage stamp here on Earth--- pure bragging rights.
More to the point: the IRGC is dug in like ticks everywhere, impossible to locate from the sky, with a cache of small weapons and rockets they can shoulder fire or launch from the pack of a PU backed out from a garage then moved. Even drones won't do any good there. Iranian drones have been effective only because their attacks have been both far and wide and indiscriminent.
The only way to deal with that really is to fight a real war, get dirty, put boots on the ground and take that battle straight to them.