I am not sure why the case is a big deal because clearly the actual button is still on the phone itself. It looks like a “touch strip”
After giving it 5 solid minuts of thought.
As a lefty this could potential cause major annoyances.
But imagining the functionality which appears to be made for horizontal camera work it would allow easy zooming in and out with only using one hand which could be useful and is good for accessibility
Could be related/experimental towards to ai vision features where its normalized to record your surroundings while you do stuff to get vocal feedback. I can imagine how zoom plays an important role into the context window the ai is provided with.