I notice that in several e-books. even the starting moves of several main lines are missing.
But these lines seem to be well discussed in the forum-sections.
I wonder if it is an idea to recruit volunteers to (temporary) fill the missing sections in the e-books. Of course you would have to do something with the format of the e-books to make clear that these sections have not (yet) been scrutinized by the (grand)masters who author the sections. Further it would not do to provide a very detailed coverage, just the (lightly) annotated main lines.
To prevent bias, ideally two or three volunteers should work together on one section.

I think this  would be of some help to the subscribers who are not so well versed in the theory to see the main alternatives that have not yet been discussed.