Good protection but few pesky details

I bought this for my protection Xperia Z1 Compact
First, this tempered glass film offers a real comfort of use that has nothing to do with the flexible plastic film that can be found. While the price is high, but the benefits are there. Protection is rigid and glue easily without bubbles (which is not the case for flexible films), the visibility is excellent, and most importantly, it keeps much less fingerprints, and does not scratch. A passage in the pocket and the screen is again nickel. Furthermore, touch is nice and very close to the original glass of the screen. No discomfort seen with the touch.
Note that the box contains two protections, which is fine, the problem is that we can not use the second protection for the back, as both have cutouts for the proximity sensor, and the camera on.
This is rather unfortunate, firstly because I do not see the interest of such a cut (the protection is completely transparent), secondly becaufe if the films was not cut, it could put the second on the back of the phone, which would be an excellent protection to ask are on a desk phone without worrying about scratches.
Finally, these two cuts are more nests dust and various traces, and it is harder to wipe the phone at these two locations because of the thickness of the protection.