I am a certified nutritionist also. I know the "book facts" just like you do. But there is also another story...real world effectiveness. I am just saying that from myself, and people I have worked with --- when I get them to up their protein up into the range I am talking about, 100% of the time the results are very noticeable.
There is a lot of info in the books that is bullsh!t. Just read some FDA stuff. I am taking nothing away from you or what you know. Just telling you what has proven itself time and time again for me and many others.