Let's say we have a document 40 pages long. The usefulness of all 40 pages vary because of end-user knowledge.
As such,
Master users will preferably only read 5 out of those 40 pages.
Experienced will read 15 pages
Intermediates 30 pages
First time users 40 pages.

Now this already is possible with a plug-in, but I fail to understand why Adobe don't see plug-ins as a clear sign that users want / need the functionality.

Ok, what would be great is being able to script a user end button that calls the sort bookmarks function. The PDF would already have bookmarks on the pages that needed to be put together.
But if a "master" then clicks the "master" button, the script reorders the specific pages and puts those exact 5 pages in the beginning of the document.

In short... a scripted button made on design level, but active on user-end.

Like I said, this is already possible with purchasable scripts, but it really should be built in in InDesign or atleast in Acrobat.

Same goes for the other types of users.