Update: iOS 11 is out now! It's 1.7GB in size, so if you're concerned at all about space, you may want to follow these tips to make some room on your iOS device.
Computers used to be all about expandability. Essentially you owned a box that could be tailored to your needs as your requirements evolved. A popular upgrade path was storage, adding new hard drives as your files grew in size and number. But with Apple's touchscreen revolution, everything changed.