Maybe that's why they include some sort of screen protector with the device? At least they did with the X4 Pro, did you get that with the X3 as well, and were you using it while it cracked if so?

I've been having mine in a beach bag I'm not too careful with, for about two months, which goes out with me when I swim in the sea, without using the included screen protector, and still no scratches or cracks in mine.