This reminded me of the Smart Battery Cases for the iPhone 11 series that come with a shutter button also on the bottom right side of the phone. I tend to rotate my phone counterclockwise to take pictures horizontally, and that position for the shutter button is the most ergonomic for me. It’s good that now the new action button on the iPhone 15 Pros can also behave as a shutter button, so as the already-have-been volume buttons, but still, I don’t think I will easily change the habit of rotating my phone. Maybe it’s because I don’t want my fingers at the left bottom accidentally blocking the camera. But more importantly, it’s a habit thing. I find it’s more comfortable in my usual way - my fingers at the bottom is more relaxed by grabbing the phone that secure the phone when holding, and I don’t need to keep watching out my bottom fingers that may accidentally blocking the lenses. By rotating counterclockwise, I found that I still tend to use my right thumb for the virtual shutter button way more than my left thumb for the volume buttons (I’m a right-handed person).
Off-topic, the Smart Battery Case was introduced for the iPhone 6s, discontinued for the 8 & X, and reintroduced again for the XS. Apple then again stopped making the Smart Battery Cases since the iPhone 12, which makes the iPhone 11 SBCs the only generation that has the shutter button. They sort of replaced it with the MagSafe Smart Battery Pack, and of course, it doesn’t have the shutter button (I don’t think it’s a good idea they add a button on that thing, though). And again, they just killed this one, and now we don’t have a battery solution from Apple official again. I like MagSafe, but sometimes I do miss the Smart Battery Case. Since the weight loss for the 15 Pros, having that kind of case would definitely be better than using it with the previous iPhone Pro models.
Edited: specified UX narrative.