Google implement this feature

Hey I've promised to do more blogs and here is another implementation google should implement into the android sdk.

On the youtube application when you view a video fullscreen it hides the navigational the on nexus devices in order for you to receive a 16 by 9 ratio.

Why can't google implement this feature for developers so you can use my screen real estate instead of having the navigational back of the system the taking up space on the screen when it could be used to better your gaming experience.

Theyve implemented this feature with the gmail applications. They also have applications in the google play store for you to take away the navigational the ups cold full screen and g m d soft key hider but they all require root and they drain your battery tremendously.

Just another thing to add I updated to android 4.3 and I'm receiving terrible battery drain I use a free 1000 800 million hour battery and that drains within half the time that I use to get on android 4.2.1.
My uncle who's using the same phone is not experiencing the same battery drain as I am I'm not sure if I'm using the phone more bot I I unplugged my phone 8 hours ago and it's on 30 percent now.

Thanks for reading