Why Ios 11 is taking 8 gb of system space?

i used to love iphone but after updating my iphone 6(16gb) to ios 11 i started hating iphones because earlier it takes around 4 gb of system space so i get 12.2gb of total space but after updating to ios 11 available usage space is only 6 gb so really hate apple now and thinking to move toward any other brand😭😭