not that anyone asked, and not like it’s been said a hundred times before, but I watched lord of the rings again and I am contractually obligated to tell everyone that the reason they couldn’t have taken the eagles into mordor is because the entire quest relied on the fact that sauron didn’t think they would want to destroy the ring.
Gandalf even says in the movies, “that we should seek to destroy the ring has not even entered their darkest dreams.” with sauron’s constant vigilance, the eagles would have been a dead giveaway that they were gonna destroy the ring. the ring’s whole schtick is that it takes such a strong hold on the wearer that they lose all willpower to destroy it.
this is also the reason a hobbit, “the unlikeliest creature imaginable,” is the only one with the strength to even make the decision to destroy it, because sauron poured “all of his hate, cruelty, and malice” into it—feelings that he felt for all races on Middle Earth, save for hobbits, whose existence he wasn’t even aware of until the events of lord of the rings. Hobbits, who cared not for power, glory, or honor; whose greatest desire was to eat, drink, and be merry (and garden), could resist the power of the ring because it wasn’t their nature to desire it.
furthermore, another “problem” often given with lord of the rings is that the entrance to mount doom wasn’t guarded. however, sauron had no reason to believe that anyone knew how to destroy the ring. having orcs guard an otherwise seemingly-unimportant entrance to a volcano (in the middle of a vast land swarming with orcs) would be the middle-earth equivalent of a flashing neon sign saying, “THROW RING HERE PLS.” Sauron, being super incorporeal and probably majorly freaking out at the time, probably had no idea that Elrond and Isildur nearly succeeded in destroying the ring, so the fact that not only did an immortal being know how to destroy it, the only other person there WROTE IT DOWN and a freaking MAIA managed to find that writing (never mind the fact that it was the one Maia who was most likely to do something about it)!
so stop trying to find something wrong with lord of the rings. you will not, and everyone will laugh at you