I smell differing assumptions are impacting this discusssion.
tons of elves died to kill Sauron. What happened to their weapons 2500 years ago?
A plausible reason was given that justifies why the world isn't crawling with them.
Frodo's mithril shirt is/isn't a plot point. If he wasn't wearing it, the author would not have stabbed him in the shirt to make us worry and then be reminded of this artifact. Plot point? meh. It doesn't change the point that Frodo carried the One Ring to the Mt Doom.
The One Ring was a plot-point magic item. You HAD to have it to set the goal of go here, drop this off.
The rest of it, you can live in a world where you question why the author did it his way and not your way, or you can live in a world where you accept a logical explanation for why things are the way they are.
The 3rd state, that the author made a mistake or is an idiot is also possible, but hopefully in good fiction, happens rarely.
tons of elves died to kill Sauron. What happened to their weapons 2500 years ago?
A plausible reason was given that justifies why the world isn't crawling with them.
Frodo's mithril shirt is/isn't a plot point. If he wasn't wearing it, the author would not have stabbed him in the shirt to make us worry and then be reminded of this artifact. Plot point? meh. It doesn't change the point that Frodo carried the One Ring to the Mt Doom.
The One Ring was a plot-point magic item. You HAD to have it to set the goal of go here, drop this off.
The rest of it, you can live in a world where you question why the author did it his way and not your way, or you can live in a world where you accept a logical explanation for why things are the way they are.
The 3rd state, that the author made a mistake or is an idiot is also possible, but hopefully in good fiction, happens rarely.