And that's precisely why millions love it; familiarity with added functionality with each new version. Unlike Android where the entire UI and included apps can change.
People want less learning curve, ease of adaptability to new features as they become available, and reliable operation. The later is due to Apple controlled hardware and top tier Android makers. The el-cheap "free" phones or very inexpensive devices did to reboot or crash spontaneously from either overheating or crap NAND onboard.