To answer the core question directly: because it serves four functions that no other object can:

: In the Brahma Kumaris tradition, "Om Shanti" is more than a greeting; it is a declaration of "I am a peaceful soul".

In an age of anxiety, you don't need more clutter. You need intentional objects. The "Om Shanti" photo frame is not just a better decoration—it is a better way to live.