Over the past day of use I’ve realised I can also swipe left from anywhere on the right edge of the screen to go back, and the swipe down doesn’t actually need to start from the notification bar. I can just swipe down from wherever and it seems to consistently figure out that I’m trying to do a gesture. I installed my normal launcher Niagara and the gestures all still work fine, so with that inclusion general operation is fairly one-handed and comfortable now, other than typing.