gday mate. My two cents, for what it's worth!
There is no right and wrong. I'm sure that the author is able to back up these two recommendations with logical theory and any amount of practical experience. Many people will be in full agreement.
And then.....
Others will disagree, for their specific reasons and/or because their practical experience demonstrates that these things aren't black and white/ right or wrong.
When researching the design and construction of ASLs, my resources recommended the riser be glued with laminations both on the back and belly side of the fades. I also followed the recommended practice of making both limbs the same length. The result has been a series of smooth, quiet, shock-free, highly effective bows.
Not for a moment do I suggest that your sources are wrong, or even that I disagree with those principles. Just that there is more than one right way!!! :wavey:Choose your learning resources wisely, and understand why you're doing things the way you are doing them. I bet your bows will be fantastic!