Surely, the take-home message is that notes made in pencil can be very helpful. I've never had a problem with that.
There seem to be a few cases where teachers have used pen, but most likely because they were concentrating on the lesson and just didn't realise what they were doing. I know, because when I pointed this out to one teacher, she was shocked. It just had never dawned on her that she was scribbling in 'sombody else's' book!
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Writing letter-names under notes is sh1te, though! A worse idea I have yet to encounter!
Sorry, I disagree strongly with this. This is one of those old fashioned 'purist' views that has no place in music education.
When first encountering those notes with ledger lines that seem to rise above the stave into the stratosphere, writing the notes helps enormously, keeps the music flowing, and builds confidence.
I've had first hand experience of this. The brain links the note name with the note position, and the fingering. This is especially true where you have many high notes with ledger lines. Writing the names underneath allows you to play with less stress, but your brain is still making the connection with the note position!!
A week later, you can play the same or similar music without writing any note names.
Music is meant to be enjoyed. Why make it harder than it needs to be?
Steve