The flip side is that every iOS update tends to make your device slower until one day you take an update that practically kills it. If you skip those, Apple's actual support period isn't a whole lot better, and because of the way they push devs to keep up, once you are two major versions behind you quickly lose the ability to download new or updated apps. This is how my oldest iPad ended up in a drawer - One of the apps I needed required an update to the OS, which ended up virtually destroying the tablet's usefulness.
Or, the grass isn't nearly as much greener on the other side as you might imagine. At least on an old Android version you can still generally download what you want so long as your firmware is at least KitKat or later, possibly Lollipop. Shoot, you can still do a lot with Gingerbread. Try using the App store on an iOS device running iOS 6 or 7 and see how far you get.