Why didn't all individual koryu evolve between 1600 and 1868? ok ... this is a bit tricky for me to phrase so please bear with me. I'm curious how come many koryu ryuha didn't change after the start of Edo period? In other words ..... how come a lot of koryu were still practicing battlefield training and weapons that were probably obselete during the Edo period? I can understand why people NOW train koryu the way they were before 1868 .... there is clearly value in preserving the culture and history now that the samurai era is gone.... when these arts don't have to be used. But between 1600 and 1868 there WERE still samurai .... and I'm sure the koryu were still used and needed ..... but why did many of them still continue to train with long polearms and in armour for example? Weren't these things obselete? And if so, why did many koryu willingly train in things that were obselete even during the feudal era? How and why did those pre-Tokugawa techniques survive the 300 years? Were they doing it for historical or cultural reasons even then? Were they thinking forward to posterity and predicting a post-Edo Japan where arts like koryu would be valuable for historical reasons? Once again .... I can fully understand why people train in things that could be considered "obselete" today, when we have the luxury of doing so ..... but why did they do so back in the days when it could have been risky? How could they afford that inefficiency?