It is truly awesome, each decade that passes the more I learn and get to observe in the area of Asian joint design modalities.

The "keyed spline joint" or more apply translated as Shachisen tsugi ..."plug joint"...Shachisen for short and most Diaku would know what you are asking about...Does not fail the way most would think...

Like so many of the Asian joints, particularly in Japan with their massive tectonic load needs...the joints are meant to "stretch" and fail very slowly...Thereby rendering the building much more enduring and flexible...compared to "oblique bracing" which not only put extreme fulcrum forces on most joints near it (especially when under 4' in oblique length...the also fail rapidly and catastrophically once over loaded...They do make a frame ridged, yet there application in Japanese framing (they do exist) are in very key and critical locations that you typically do not see in Western framing systems...Glad you enjoyed the video...