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Stub I don't think formal pedagogical training is or should be required for someone to teach piano and, imo, is something that might be nice to have, but not required by any stretch.
I've encountered good teaching with no formal training, and also bad teaching with high credentials, so I agree. Stub, I was cautiously addressing a situation that was brought up here. What you responded to had two elements: training and experience.
Mention was made of (an) individual(s) who regularly criticize(s) students, always with the same critiques and I'd say assumptions. Experienced teachers are the least likely to do so because you need to assess where a student is at, looking at a lot of different things they're aware of. The title "teacher" carries authority in people's minds, so that they may doubt themselves. If a person say they "teach" - it can mean working with a handful of students in some capacity - that does not give the broad overview needed to assess people on-line. In fact, the experienced teacher is the least likely to do so.
The subtopic here seems to have been the idea of teachers giving feedback here (though I might have misunderstood Ranjit). I don't think that experienced teachers whose primary job is teaching would do something negative. I do suspect that they might refrain from assessing, because they know how much is involved.
hope this clears that up. I don't like the feeling of stepping into a hornet's nest. This site is it's own place and that is FANTASTIC.