This will also help for the problem of looking at the display at an angle. When I try to tap the display while looking at it from an angle, I seem to miss the target. With one less layer of glass, it should get better.
Add-on touch screens have probability of liquid getting in the gap and spoil the touch function. I faced it and replacing the touch screen is an expensive as 40-50Euros. For smartphones, its about the 10% of the original cost. Hopefully, we find the integrated solution soon.