The camera button had so much potential.
As many others have said before, touch ID could have finally existed again. The scrolling capabilities of the camera button can also be used for scrolling in general use such as a news article or TikTok. There is so much potential for it, but it's only limited by that one use, similar to the mute button on previous iPhones.
For those, like myself, who have no idea what the OP is banging on about.