Elves who worship human deities take themselves out of the cycle of reincarnation, to leave the elven gods behind is to leave the elven community for all of eternity.
The whole idea of elves having special connections with each other (and their gods) seems to have vanished. No special elf-related dialogue with Astarion at all. I might be hopelessly out of date - are communing and bonding even things in the lore anymore?