In my experience over the years, no sooner than you make a fancy book, you will receive or discover further material and the book will need to be revised. It's a price worth paying! The advantage, of course, of a digital book is that the updating is easily done.
I use MS Word for my various family history books and nowadays, Word has all the versatility I need. Once I create a new version - which is always a big size because of all the images - I save it as a pdf version (takes seconds) and that makes it easier to email.
I imagine that the fancier programmes for books are more important if the book is to be printed out, but even then, you can always print from pdf.