Animisha The question in the video was: "What if each small spot is 90% success rate, but when you put the whole piece together each time you fail in different places, so that the total success rate is 50%?"
That question was from me . As Dr. Gebrian was giving her answer, I realized how my wording failed to convey what I really had in mind. This happen to me a lot when trying to ask short questions. And English being my second language certainly does not help.
What I meant by "success" is more like perfection. So that 10% failure can be 2 kinds: slip of finger (or mind), and less that perfect articulation or dynamics. As an example, if I play a phrase 10 times, I had one slip of finger (wrong note) that I immediately realize. I also know it's a random mistake, it is unlike to happen again the same way, and I won't be committing any bad habit to memory. At that point, I let myself move on from that phrase. I may come back later to it, though.
Now the 50% success rate when putting the whole piece together. Again I am thinking perfection. There still can be occasional slip of finger/mind. There is always more unsatisfying control of dynamics - I find this a lot harder for my beginner skill. And because the playthrough is longer, chances of these kind of small imperfection popping up here and there randomly makes getting a perfect recording in one take even harder, thus the 50% success (or fail) rate. According to Dr. Gebrian, when this happens I should abandon playthrough and just go back and practice sections or phrases. I rather make a case-by-case judgement, mainly based on whether the fail or small imperfection is repeatable or not. A slip of finger or mind? That's random. I will keep play though and just keep my concentration better. A slightly off articulation or dynamic? I can pay more attention the next time in the playthrough and see if I can change that. But if any mistakes happens the exact same way twice, then my alarm bell rings and I stop and do that bar in isolation until I figure out what's wrong and what's the fix.
Both kind of errors I mentioned, slip of finger and imprecise dynamics, are most likely a sign of deficiencies in fundamental technique. But then for adult beginners like me, I feel improvement in technique cannot be expected to happen in a very short time span. So rigidly adhering to standards could just stall my progress to the point that might demand the kind of perseverance and grit that I am not sure I have.