I love libraries, I just think they are better utilised for storing books.
Adding all these default virtual folders/links to a single user desktop system is merely confusing, time wasting, and unproductive for many users.
If you have your system sorted out properly you simply don't need libraries.
This is reflected in the absolutely huge number of users looking for ways to disable and remove them. They just want to click on a folder of their choice, they don't want to drill down through what to them is merely a load of useless bloat in order to find a file. Nor do they wish to learn all the complicated rigmarole associated with such things.
There are doubtless plenty of users who like libraries, and that is fine, the problem arises when one is not given the choice.
People do not want to be told how to set up or do things or be forced into using a system that does not work for them.