>>279701767
It makes sense
>elves can live for thousands of years
>they breed like humans
>their numbers explode since they don't fucking die
>local resources start running dry because there's too many elves
>either most of them starve or they completly suck the land dry and move on with their numbers growing endlessly until the entire biosphere collapses under their weight
Long lived species not having many offspring is a thing in real life for a reason.
The obvious weakness is what happend in Frieren: A sudden massive population collapse like through genocide is something the elves simply cannot recover from with their mix of low numbers and low sex drive.