Thanks for the info.

I suppose the following GMP reference could also be mentioned :

GMP 4.4 Documents containing instructions should be laid out in an orderly fashion and be easy to check. The style and language of documents should fit with their intended use. Standard Operating Procedures, Work Instructions and Methods should be written in an imperative mandatory style.

It is really about making sure new SOPs/ Policies are easy to read and understand by staff. Having information written as text book chapters isn't helpful- and also contributes to the amount of time taken to write these unnecessarily long documents, that are of little benefit to anyone.