This is just... yeah, the idea of Miriel putting her grandson into tapestries makes me happy. And the conversations between Maglor and Rumil were interesting even though I'm not entirely familiar with the whole S vs Þ/Feanorian alphabet situation.
My favourite was the different versions of the tapestries and the associated conversation between Maglor and his father. The idea that the Valar would never be able to tell the elves' stories as well as the elves could themselves is a thought-provoking one, to me.