I am a true believer in Sendero. I wiped out whole stands of mesquite with great results - I am guessing about a 95% kill rate. However, I didn't use a drone or broadcast sprayer. I used a hand wand from the sprayer on back of my tractor. (Also had a small tank on a SxS that worked. Sendero notes it works for honey and black locust. It doesn't harm any of the other trees and plants.
The other miracle herbicide I discovered was Tordon on cactus. I had literally hundreds of acres of pear cactus that we had aerial sprayed. A dog could run through a pasture it was so bad. First year the cactus looked sick. Second year it had about rotted away. Third year - nothing to see and zero regrowth.
FWIW