Articles published in peer-reviewed journals would be a lot more convincing than e-books and articles dredged from other sites selling other products.
Maybe the "layperson" doesn't want to digest scientific publications, but not all of use are laypeople. You've said nothing that is even remotely convincing.
Read the conclusion in the chapter you cited:
Although much has been discovered, many aspects of magnesium still remain unclear and await discovery
It's a good effort and a nice collection of old studies, with a very detailed discussion about "stress", but there's nothing compelling there to say that magnesium plays a significant role, in spite of a very strong effort to make it fit.
I agree with deltawave. Do you actually read the links you posted? I read your suggested chapter as well as a couple of others. There is not one suggested mechanism or association that Mg affects skeletal muscle relaxation/contraction. Yes, Mg is associated with smooth muscle relaxation (this was noted multiple times in both your book and other peer reviewed articles) but NOTHING with skeletal muscle.
May I remind you that a RELATION DOES NOT IMPLY CAUSATION as your arguments wish to suggest. Even in your own suggested chapter the authors readily admit there is no direct evidence for the stress/magnesium cause. And that is the risk of lay-level science. It tends to oversimplify things to the point of fallacy.
Extrapolation in medicine can get one into BIG trouble, and intuitive leaps of the type being attempted by the "magnesium crowd" are worthy of Gem Twist or Sapphire, but not worthy of being called "scientific".