For me it's not even about one-handed use, I can reach the opposite corner just fine with one hand, but the bulge in my jeans' pocket is really uncomfortable, the corner of the phone pinches my leg and you have to rearrange the brick inside the pocket quite often or it hurts when walking.
I'm this close to replacing this huge thing.
[1]: https://www.phonearena.com/phones/Apple-iPhone-7_id9815/size...
Typing with the physical keyboard was great and a much more conscious activity than now with on-screen keyboard. Also I could type much faster, never reached those speeds with any on-screen keyboard.
Probably have it lying around in some drawer, will have a look for it but I'm not sure it's still good enough for anything.