No, you get me wrong. Jinsoyun's storyline did make sense because for one the character did not come into power as of yet. And sure, we got a few glimpses of the character showing off that power, such as the ending of act 4, which was the major point of where it was shown off. It was shown off a little during act 7 against Zulia, but even then the character couldn't even get close to her despite all the power the character is claimed to have. Now if they actually exchanged a few blows before the character got away, then perhaps it would be more believable. As for Mushin, the character continuously loses to him despite all that power. Sure, you get the chance of fighting him, but you still lose regardless. It would be a lot more impressive and believable if there was some sort of struggle on Mushin's half. Sure he might have achieved what he wanted in the end, but if there was more of a struggle against the main character to achieve that, instead of him showing up and pawning your character like a total rookie and newbie.
Learning from what mistakes? The main character really learns from any mistakes. Regardless, this topic really has nothing to do with the main topic of this discussion, which I said was already answered. So why both changing the topic to something else. And sure, I get that it's a game. There is a difference between being 100% perfect, being a complete idiot, and being very powerful. Sure the person can make mistakes, but there was no indication that the character was making any mistake when they fought against Mushin in Act 8 or when the character was facing Zulia previously in Act 7. The character was just completely outclassed in every way. They didn't even manage to land a hit on the opponent at all, and that contradicts the fact that the Hongmoon Arts are supposed to be very powerful.
Come on at least land a punch or a kick. Is that too much to ask for? Anyway, this topic is way off-topic, so I suggest dropping it as the original question was already answered.