I don't like this book very much, because it focuses too much on "Piano Playing".
Piano Playing is a pretty important part of playing the piano!
Is it as important as the music-making?
I don't like this book very much, because it focuses too much on "Piano Playing". rather than on understanding music as a universal language of expression.
I'd advise not reading it, you're likely to be horrified when you find out the subject is piano practice.
I read it a long time ago At a certain point, you stop 'practicing', and the time you spend alone at the piano becomes 'rehearsal'.
I can grasp this quite well mentally. It might be in part true for me already, but at which point it would be entirely true I can't say. If I had the opportunity for regular, rhythmic practice ... a few weeks? A few months? A year? A decade? A lifetime?
I would say it depends on your overall level of fluency with the keyboard. Once you can do something like improvise your national anthem comfortably with both hands in any key signature, you have probably discovered how to run your own rehearsal quite efficiently.
I see that this is a kind of theme for you, and seemingly your particular measuring stick....... And, right now, I have other ideas that are more pressing to me.
Once you can improvise, you can do anything you like with any theme you choose! What theme are you interested in then, if comfort with improvisation doesn't interest you?
Do your homework.
This book is interesting, but quite dangerous. It's easy to misunderstand her instructions and build a lot of tense habits as a result, even though the purpose of the book is to free up the playing.