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.

Like I said, this is already possible with purchasable scripts, but it really should be built in in Acrobat and perhaps even more importantly in InDesign also (or instead…)

Same goes for the other types of users.