> It hasn't produced any fruit.

This as well is a good argument against the book. The fact that there doesn't appear to be anything brought forth in other fields, or in the same field of work as the book doesn't bode well for it.

Then again, there have been many time in history where something was written or put down, which wasn't known or seen to be relevant, workable, or whatnot, until many decades or centuries had passed. I'm not saying this book is a case of that, only that it might be. We don't really know, and can't if or until it happens, of course.