Earlier quoted context omitted.
I can't help but agree. I've been playing piano since childhood too, though in a desultory, non-Conservatory way. It's been great fun reading through this comment section and seeing Piano HN, but I'm really surprised that this is the first comment that acknowledges the skub-nature [0] of the book, and that the author doesn't actually play piano but in fact armchair-QBs it via observation and discussion with his two d…
There's a specific thing I always remember about this book, which is that the author recommends the "thumb over" technique for scales. I would never, ever suggest a beginner to approach scales like that. Thumb rotation is super important to absorb and master. Of course, when you go for fast scales you do a "thumb over" which is not really that, but instead of the thumb rotation, you reposition your whole hand using y…
To belabour this point for non-pianists, the parent is describing what "thumb over" really is: a sort of physical consequence of playing a fast ascending arpeggio/scale. It isn't an alternative to "thumb under" so much as a good-faith approximation of it at speed. "Practicing" "thumb over", as in this YouTube video [0], would likely threaten the mapping of fingers to keys in a newer player. It's not wrong to acknowledge its existence, but IMO it's properly conceived of as a skill that develops as a consequence of playing normally (though quickly), not an alternative to it.
Because (and in spite of) the fact that he doesn't play piano, his observations on "thumb over" are interesting, but unless you're already aware of the true nature of "thumb over" his authoritative tone will lead you astray in terms of conceptual categorization.
[0] https://www.youtube.com/watch?v=ZLTbURVEEO4
[1] https://fundamentals-of-piano-practice.readthedocs.io/chapte...