Questioner
What was the reason for choosing the base form of Shardblades as blades, why not another form? Was it because of the spren?
Brandon Sanderson
Why was the base form of Shardblades chosen to as blades, as swords? It is because the Shardblades were devised... They were devised as imitations of the Honorblades, which were created and given to the Heralds. And so since the original pattern was the Honorblades, they were built to feel like the Honorblades.
JordanCon 2014 (April 11, 2014)