Hmmm....
This is a quote concerning that very (ahem <img src="/forum/images/icons/wink.gif" alt="" /> ) point from this site:
http://www.thearma.org/essays/damagededge.htm "It should be noted that the same physical laws regarding edge damage also apply to the use of traditional Asian swords. For example, in one interview an expert of the Japanese, Daito-Ryu style, senior swordmaster Tokimune Takeda noted: “In order to cut your opponent, you need to set the blade of your sword in a specific position; you need to turn your sword this way [gesturing]. You receive your opponent’s sword with the [blunt] back of your sword and then you turn your sword to cut him. This is not how you hit your opponent with a bokken [wooden sword]. Since a real sword has a sharp blade, you need to receive your opponent’s blade with the back of your sword. You should not receive it with your blade [edge] because if you do so using a real sword, the blade will be nicked. But if you receive your opponent’s sword with the back of your sword and then go to cut him with your blade, the cutting edge will never be nicked.” However, the interview author also comments that: “Other classical sword schools, such as the Tenshin Shoden Katori Shinto-ryu, the Yagyu Shinkage-ryu and the Tatsumi-ryu, taught to receive cuts with either the side of the blade or the lower edge. This is because the metal making up the back of a Japanese sword is softer, and a direct blow to the back of the blade would 'likely' cause it to snap.
Practitioners of these schools were evidently willing to risk a nick to avoid breaking the sword.” (Daito-ryu Aikijujutsu: Conversations with Daito-ryu Masters, edited by Stanley A. Pranin. Koryu Books, 2000. Copyright 1995 by Aiki News.) However, noted swordsmith Paul Champagne, who studies the historical technology of both European and Asian blades, notes that softer steel, by its nature, does not "snap" but rather, simply dings more easily. He adds that not all of the construction techniques for Japanese swords had soft backs. A strong cut on the back can cause an edge defect to open up with the natural rebound of the blade. (Personal correspondence with the author, September, 2004). In contrast to Japanese, Medieval European cutting-swords do not have an outer layer of softer metal and were designed to be especially resilient when receiving blows on their flat sides."
As to the value of forms vs. freeplay, there is some need for form work and katas. Or in ARMA terms stance transitions, cutting drills and flourishing as we don't really have long set katas in the Japanese sense. But, my experience in other martial arts besides this one is that without free sparring as at least 50% of your training time, you are just not going to develop a skill you can use against resisting competent opponents. That goes for any art, not just this one IMO. <img src="/forum/images/icons/grin.gif" alt="" />