'Its about death, the inevitability of death'

[tifo_gcs]

So Tolkien gives us the elves and their being trapped in this world as a message that says don't be afraid of death because its better than constantly losing friends/places etc. as you move through life.
(The elves fighting the long defeat in the Silmarillion comes to mind).
In other words, the longer you live, the more you suffer and the less you enjoy life.
And by the way, i find poignancy the biggest/most occuring emotion in life.