Runestone

No, it doesn't and you don't. I am using the eye sensor all the time and it always shows the display when I turn on the camera. It also always turns on the viewfinder when I put the camera to my eye. What could happen in low light is that it doesn't shift back to the display when you put down the camera. But then you only have to push the right edge of the eyecup aside a little.

I am left-eyed and I prefer cameras with the viewfinder to the left like XPRO and XE2 rather than having it in the middle. With the viewfinder in the middle I tend to poke my right eye when I push the buttons at the back.

I like the X-Pro2 but miss an eye-cup. Being left-eyed I don't come close enough to the viewfinder to avoid stray light. Since there are no eye-cups available (at least that I am aware of), I decided to make one. I bought Nikons DK-19, which has the right diameter. I then took out the small rubber ring around the viewfinder and stitched it to the DK-19 with an ordinary sewing needle and thread. Using black thread it became almost invisible. I then pressed the ring back into the grove around the viewfinder. To me it has been an improvement. An alternative would have been to glue it to the ring with rubber cement. But then it would be difficult to remove without traces. But I suppose that a new viewfinder ring wouldn't cost much.