I use the action button to turn orientation lock on and off. Apple didn't include that in the default options for some reason, but it works through Shortcuts. It seemed like a waste of a button, but I found I wasn't using it when I had it set to activate the camera. And now with orientation lock, I use it all the time, whenever I'm watching a video and want to expand it. This way, I don't have to interrupt the video by opening control center. I just turn my phone sideways and hold down the shortcut button. If you find you're not using the button at all, it's worth a try.