Have you ever noticed that 'elf' and 'milf' end in the same two letters? Is there a connection there? I'm pretty sure there is, but I'm not sure how to articulate it.
I believe I have the answer, what is the most beautiful type of elf? A milf, a milf elf is the best. Want more? Sure. Elves have low birthrates, coupled with their long live spans and they all want to care for their child, as such an elf wanting to be a milf is the best course for an elf. Want more? Sure. For hundreds of years, they've tried to get pregnant and have failed, frustration + sexual knowledge = a sexually competent partner wanting to be a mother. I repeat an elf wanting to be a milf is the best.
But in all seriousness, I can see why the long lifespan can be an issue when you think about it. A being that can live for generations, if an elf gets a position as say a royal advisor to humans, then they would've seen everything of history and there wouldn't be any falsified information, for reasons like that when an elf has seen whatever the main incident that changed the world exists and said the world is built upon lies I find it hard to believe the elf wouldn't want to stop that injustice, unless there's a reason in the story for it but if there isn't then who would not believe the person whose lived long enough to be there? That's why I capped the max lifespan for all lives to be between 400 and 500 in my stories.