This may come as a shock to anons who filter their entire existence through video games but literature does not need to operate according to rules of game balance.
Yes! The answer is “you can’t, and that’s the point.”
It just makes other threars in the world feel a bit meaningless
No necessarily. Sauron was taken by surprise, so he may have countermeasures at his disposal if there would be other encounters.
Even if not, it makes the refusal of Aragorn to use them again even more noble, which is the literary goal of their existence.