Originally Posted by JerryScript
Locking the desktop prevents you from making inadvertent changes. You've heard of pocket-dialing? Imagine your phone with a pocket-desktop created theme! Just one example of locking's usefulness.
My daughter uses the two I bought my boys as mini tabs and kept rearranging or even removing all there apps, she's 4 and autistic, she thought it was fun to see the background uncovered so needed a way to keep them locked in place. And yes I've had pocket themes