We weren't talking about the missile anymore, we were talking about a furnace outside of mordor.

I talked about the accuracy and precision in another comment chain, as well as a preemptive strike on sauron's tower.

Missiles can actually be highly accurate with the right technology, albeit at a significantly increased cost.

The eagles are majestic beings who serve at their own will due to their friendship with Gandalf. You're not using them as kamikaze drones.

The orcs don't know how to use explosives. Saruman does, and they were so unheard of at the time that he had stop Wormtongue from holding a candle over a pot of black powder to get a better look. Saruman, the wisest of the five wizards and head of their order, made the explosives and showed the Uruk-Hai how to use them.