You'll found that iPhone 8 Plus (5.5 inch) is not for you. Screen diagonal inch is bad metrics. Let's check real outer dimensions.

My hands use the screen, and they're of a certain size. If the screen is too big, I can't use it with one hand. The iPhone SE (the original one) can be used with one hand; if they would convert the bezels to screen I wouldn't be able to. I can't use the new iPhone SE with one hand.

In short, I think it's a good metric.

good point, i have never used an iphone but the pixel 3 was pretty comfortable to use.