I've owned the x-pro 3 shortly since after release and I've taken thousands of images with it. I mainly use the combo of evf/LCD when composing. Like you I turn the camera off to save battery. My advice to you is: Don't worry about it. The expected shutter life for the x-pro 3 is more than 200K+ actuations so unless you only shoot at the max 20FPS it's a non issue.
Dan
The viltrox 75mm looks like a superb lens considering the price Have you by any chance tried it on an "older" body like an x-t3? If yes, how is the atufocus compared to the t5?
Edit: Great shots, thanks for sharing!
Greetings from Norway. Joined over from DPR. Been a long time lurker and Fuji fan. Shooting mainly with a Xpro 3 and the mighty 35mm f1.4. Hope to be able to contribute a little over the coming years.