Google decided to reduce the importance of SD cards with the release of Ice Cream Sandwich.
It appears that Google’s changed its policy in what concerns to SD cards. With Lollipop and thanks to the ACTION_OPEN_DOCUMENT_TREE inten, applications can now access the entire SD card. This will give more freedom to the developers. Naturally, the choice will be given to user, but having richer access for certain applications may bring some potentially very useful apps.
This could be very useful for camera apps, sound recorders because other applications will have easier access to content that has been created. This should also save you the headache when your SD card decides to stop working or crash your apps.
Android Lollipop is still at a very early stage but soon we could see if these works or not.