I have read Naomi Fisher's "When the naughty step makes things worse" and found it hugely disappointing.
Last year I made a post that was very critical of needlessly strict schools like Mossbourne Academy in Hackney https://www.mumsnet.com/talk/secondary/5225872-mossbourne-academies-investigations-into-alleged-emotional-harm-and-abuse-why-are-needlessly-strict-academies-unaccountable and found Fisher's comments on that very insightful:
https://www.linkedin.com/posts/naomi-fisher-psychologist_vexatious-complaints-over-the-last-few-weeks-activity-7274398835781648386-shxo/
The book, however, was a disappointment, because the whole message boils down to: don't stress out, a lot of things you think matter actually don't, giving in to your child isn't the end of the world, and most things will ultimately sort themselves out in the end.
She makes many examples like letting your child have another sweet or letting them sleep in your bed isn't the end of the world, not worth a meltdown, and the whole premise is that everything will magically sort itself out in the end.
Well, what if it doesn't? On this, the book is completely silent.
I fully agree that picking your fights is important, but the author presents no compelling evidence that everything will sort itself out and that these methods won't produce nasty, spoilt, entitled brats. "Don't worry, it worked for me and for some patients of mine" is not exactly a very scientific approach.
I can certainly think of a few cases in my extended family and circle of acquaintances where this kind of gentle parenting approach produced exactly that: nasty, spoilt, entitled brats used to always getting their way.