Last Sindar cartoon for a while!
The books say that while the Sindar of Doriath invented this runic alphabet, they didn't use it much except for a few inscriptions and monuments. The Dwarves, however, adopted it and used it so much that by the time of Lord of the Rings most people in Middle-earth assumed runes were a Dwarven invention. The reason why the Elves didn't see much use for writing, though - as expressed here by Lúthien - is my own assumption.
For the record, the Noldor over in Valinor are also inventing their own alphabet around this time, in a separate and unconnected action. We'll come to that later.
Part 112: Easy as ABC
Next time: Part 113: Changing places
Chibis by tektek.org