According to my LIghtroom Analytics, I used this lens for 0.5% of my shots last year, its not that its a bad lens, it just never seems to find its way onto my camera.
Its an interesting thought, that says if you take the 23mm lens, and crop out of the centre of the image to the equivalent 35mm lens view, you will end up with a 10MP image (assuming you started with an X-T2). This is more than good enough for most of our needs, posting in forums, flickr, etc and the occassional print etc.
Equally you could do the same with the 16/23, 35/56, 56/90, are we guilty of collecting too much glass for our actual needs??
You could say yes, but then you could say that each lens has its own characteristics......... thoughts gentlemen........
Anyway I think I'm going to stick the 35mm on the X-E2 and make sure I just use it more, that way I'll use the others on teh X-T2, assuming I can prise the 23mm off it!!!