One of problems was that you couldn't do back to S Mode if you wanted to. Having an option in the Activation section of the Settings app, will make it easier for users to go back to S Mode if they want to. However an important thing is that this will becoming to the 700 million and growing users that use Windows 10. This means that any of those PCs in theory could be enabled to run on S Mode.
This makes it much more accessible for schools, businesses and consumers if they want a secure, smooth and locked down experience.
On other news, it seems like Warn Me before installing apps from outside the Store will become the new default option for Windows 10 users.