Of course not.
I've tried working on pet projects for 10 minutes before going to work each day. The problem I find is that while I might only do active work on the task for ten minutes, my brain is thinking about it for much longer.
Spending those ten minutes in the morning reduces my ability to do my day job because I've used up a significant fraction of my day's useful thinking budget. I find I can only sustain these pet projects when my day job is in a boring/easy phase. (This might have something to do with getting older - I'm 42, or it might be because my job isn't boring/easy much these days).
Like the term “useful thinking budget” - will steal that if I may. To me that type of thinking is usually deep and involves much lateral thought than logical. It’s usually where I establish “focus” on something I’m working on and usually where creative breakthroughs happen on things blocking me.
But it only happens when I’m alone, relaxed and undistracted which is usually the shower in the morning. Going for walks also helps. Also it seems to require feedback “did this idea work in practice?” which creates positive reinforement that my ideas are worth having. Just endless producing ideas without testing them is undermining - used to do that in my early 20’s
FWIW, I do agree with the original comment at the top of this thread that this technique couldn't yield 48 books in 2 years - there's only so much headspace available, and this technique is one that taps into that headspace effectively for long-term projects, but it's not magic.
Is it because of the technology you work on, or is it the age factor?
I've not programmed long enough to actually feel this effect.