[Inziladun]

I can't think of anything textual to support this, but maybe the Lindon Elves just had it in their minds to leave the Edain to their own devices in Númenor, at least at first. Then, perhaps when the Númenóreans began voyaging east, and the Eldar in Middle-earth learned they were visited by parties from Eressëa, they thought that level of contact with Elves was sufficient. Maybe they foresaw the eventual issue that arose with the Númenóreans desiring immortality.