SharePoint is a great collaborating tool and helps big enterprises to manage and share their documents well. But you must be aware of the fact that migrating to Microsoft SharePoint often comes up with the risk of low user adoption.
A big change in the working process often sees resistance from the users. Since most users are comfortable with folders, this shift is not so easy and needs proper training and education.
Folders and their sub folders often come up with limited ways to store the documents. Since they present only a single way of document grouping, it may not work properly for everyone. Organizations may have different approaches to storing or managing their information depending on their search preferences, role in the organization or professional background. Some users prefer to see documents categorized by business area while other may love to view it based on year.