Middle-Earth Geneaology

[akhtene]

As I understood from Appendix, the future of all Elrond's children had to be linked with Elrond and his leaving ME.

But to the children of Elrond a choice was also appointed: to pass with him from the circles of the world; or if they remained to become mortal and die in Middle Earth.

And that's what Aragorn says to Elrond

Master Elrond, the years of your abiding run short at last, and the choice must soon be laid on your children, to part either with you or with Middle Earth

So it seems to me that by not accompanying Elrond to the Grey Havens and then beyond the seas all his children chose the fate of mortals. I just wonder why they were offered such a limited choice (made so dependent on Elrond in that matter) Isn't that just a bit unfair?