Battery life is subjective, there are lots that have worse battery life. I'll stand by what I said, for last several updates, the camera is the main upgrade with a few things tossed in. It's always the camera they center on for upgrades. I didn't say there was no other upgrade features in upgrades, just mainly camera.Contrary to popular belief, battery life is DEF improved for my use over my old N20U. Not just camera. Screen resolution also blows away my N20U. Brighter and sharper.
Even with a maybe sharper image, that is also subjective to individuals, I thought the note 9 image was horrible, several disagree with me. I agree with you, I think the S22U has good image, probably the next biggest upgrade over the camera. For me, it's the biggest upgrade, I'm not that interested in the camera, point and shoot is all I need.
I personally would upgrade for the sole reason the note 20 is 2 years old, that's me.