[Mithalwen]

Elrond did not claim kingship of the Noldor remaining in Middle Earth - of course the numbers were so depleted to make the title almost ridiculous but by blood he was probably entitled - so it would have been odd for him to claim it in Aman. Galadriel didn't use the title of Queen even over her Silvan subjects so again unlikely. I imagine that,in Aman as in Beliriand each headed their own household and followers, but that Finarfin remained as nominal head. I agree it is fairly meaningless.

There is no real suprise in Tolkien not writing more about Aman without the rebelling Noldor. There is little drama and interest in people being endlessly good and cooperative. No, Morgoth, no Feanor + same old, same old...