Being able to open your security screen allows for easy access. Be it passing food into an entertaining area, or in case of an emergency.
The biggest advantage, on a day to day basis, is the accessibility to open the screen to clean both screen and window glass, for a perfect view.
It is true that security screens cover some of the open space of the window, due to the mesh component of the screen. But, what you give up in open space, you quickly gain back as you can now have your windows fully open 24 hours a day.
A high quality security screen can be so much more than just a bug stopper for your home. When it comes to choosing security doors and security window screens, make sure you pick one that covers you for everything life can throw at it.