2nd subtopic, in case this works
What is being taught and/or practised. What is aimed for in that practising. Is it narrow or broad? I hope I can manage to get the words.
When we learn as students, it can be a narrow path of getting this assigned piece in all its details so that it sounds right and will pass. Aiming for this detail, then next one, the next one. Correct notes, dynamics, timing. One can aim specifically for each thing, until each is right. That's sort of like throwing beanbags into holes without missing. But is that a good way - or the only way of working?
The pieces we work on involve skills and subskills. So there are other things to focus on attached to the notes of the piece. Supposing I'm at dynamics or articulation (loud, soft - staccato, legato). What if I experiment with all kinds of ways of doing loud and soft, including the opposite of what I've been told? What if I have a huge leap and that new note is to be played pp, but the velocity of the leap makes it go loud through the momentum? Can I experiment with my assumptions about dynamics, leaps, and timing?
Or, if I'm making a mistake, might I duplicate and exaggerate that mistake to find out its cause? One thing I was missing because of how I started was having the hand move in and out of the fallboard for black keys and shorter fingers. That made playing awkward, missed or faded notes. When I learned to move in, I also experimented with what happened if I didn't, and the comparative awkwardness and stiffness made me understand this better. At the same time, if I was "just playing" music and suddenly a hand felt awful, I recognized the sensation and knew what was going wrong.
I think where my gut is leading me is, what if the idea of "mistakes" is actually addressing "excess specificity" (where it exists). Maybe the remedy is broad experimentation and exploration, where that's not there.