That explains a lot. I never use a camera one-handed, although I often carry one that way (I use only wrist straps) when not in a bag or pocket.
There are situations where I may need one hand to hold the subject. For example, when photographing a flower on a breeze day, I would hold the stem to keep the flower steady.
It’s also about moments when I’m not using the camera. I need (and found) a good grip to carry the X-E5 in one hand while walking to my next photo position. During concerts, these are short stretches where I want to lower my camera (so carry one handed) between shooting (two handed).
Yes, as I mentioned in my earliar reply quoted above. I don't have any problem carrying a X-E5 one handed. It's all down to how it's held and the right-hand doesn't need to be in a "ready to shoot" position when carrying. Repositioning while lifting to the eye - with both hands - becomes second nature.
Right, gotcha. I was extremely tired when I posted that. Just took a small nap and comprehension mode is on again ;-)
I'm from the good old analog SLR days when it was obvious to make photos with two hands. Definitely with Olympus SLRs! The shutter speed dial was around the lens, so the left hand was how you set it. It stuck with me. I use two hands even with the 23/f2.8.
The challenge was finding a grip to carry the X-E5 comfortably and securely in one hand when lowered between shooting with the 16-55mkii or the 56WR fitted. I got a bit spoilt with the big grip of the X-S20 that allows me to hold the camera loosely with two fingers. With the X-E5, I need to grip it deeper into the palm of my hand and then it's just fine. The buttons are well positioned that they don't get pressed, but I need to practice switching to my shooting position without accidentally changing anything.
I used Olympus OMs too. Lovely cameras
My "carrying" grip is a bit hard to describe (and I'm certainly not going to do a video of it!) but it positions the camera in the right palm with the thumb around the top of the lens and all four fingers around the baseplate,and with a wrist strap of course. Works better the smaller the camera but works fine for the X-E5 with a small-ish lens.
The method came from my fondness for fixed-lens rangefinder cameras of the film era, my all-time favourite being the Olympus 35RD which is in many ways like my current X-E5 with 27/2.8, albeit a bit smaller and lighter than the Fuji . Given Fuji's use of film-era style and general ergonomics it feels completely natural.

Olympus RD: 481g, 114.3x69.9x57.2 ( Image and data from cameraquest.com)