Why is it that ancient Japan has always been far weaker than China in shipbuilding, but the sword is made exceptionally well. Naval warfare can not close combat but very fierce, the samurai's strength

Why is it that ancient Japan has always been far weaker than China in shipbuilding, but the sword is made exceptionally well. Naval warfare can not close combat but very fierce, the samurai's strength in single combat against the sky. 1, ancient Japan can not just go to sea, go to sea must have the daimyo (feudal lords) issued a license, and the daimyo on the shipbuilding industry does not care about ---- because at that time the war is fought on land.

2, the ancient Japanese samurai's lifelong goal was to kill people, so naturally the level of close combat was not bad.

3, the pirate's ship is the smaller the better, the small boat is fast and flexible, the big ship instead of not much use.