The one hardware thing that I think would be huge is something I’ve been chewing on for a few years now, ever since that expandable Motorola phone that you could sub things on/off.
Built in Pico Projector. The resolution and lumens doesn’t have to be the greatest in the world, but the ability to throw images, videos, notes, anything onto a wall to share them with groups would be amazing. I would happily sacrifice a bit of thinness for that ability.
Another minor note, I would appreciate a second FaceID camera next to the pencil charging port, or moving the FaceID camera off center. If I’m working in landscape my thumb is covering the camera pretty often. That’s a small thing.