I still do. Phones can be turned to view it either way. Screens can't. I'm not gonna ask my bud to get up and rotate his living room TV 90 degrees so we can look at my vacation photos. Plus, until we learn to levitate with our minds, the plane humans interact is and will presumably remain much, much wider than it is tall, so landscape captures more of it.
I don't know. If I balance the phone on my pinky, with the index finger on top and ring- and middle finger behind, it sits very solidly. My thumb is then free to tap the shutter button.
I usually change settings, my phone is big. Like depending on the scenario I might change my frame rate on the video or the optical zoom. I find it too difficult with a pixel 6 pro and my hand size. Also I use rotation lock because it's annoying if I'm laying down to have it rotate on me. So then I also need to tap the icon in the lower corner to rotate it, or disable it while I take a video. Lots of mucking about for one hand.
That's true, but I find it just as difficult to access those features onehanded in vertical orientation, so I either do those twohanded before shooting, or I struggle about as much to reach them in either orientation.
I suspect that the sensor has the same dimensions, roughly, as the phone itself. Putting in a square one would probably cost more. Not saying that either way is right, just that that’s probably the reason.