Border around the screen
this basically boils down to why dont make the whole front of device a screen and why have borders around everything on the screen too.
Why not replace the material around screens with the screens?
I guess the reason (a very bad one) to have a border around a screen might be to make device thinner (components inside are more spread out) but I certainly (and probably most people) prefer bigger screen and a bit thicker device than the same bit thinner and wasted space.
Why also have borders inside screens In my opinion one border is very stupid.But another border inside the screen and on outside is completely idiotic.
This issue is most apparent on small devices like smartphones.
Not the best example: Galaxy S2 (right click to view in new tab to view at full 2000x2217 resolution)