As said many times before here, many call iOS "clunky" because, even though the UI might be "simple," it's still inefficient--compared to Android--to navigate to important information. For example, from my Android homescreen, in ONE click/swype I can
- adjust the brightness
- call a number
- bring up a text message to a contact
- check what apps are using battery ("but you wouldn't need to do this on an iPhone!!!")
- toggle wifi and 3G
- toggle bluetooth
- toggle auto-rotation
- add an event to my calendar
Of course, this list doesn't even reference all the widgets that directly and indirectly provide information on the homescreen. Android fits my preferred user experience; iOS doesn't.
That's great. Not being sarcastic either, it's all well and good.
However, imagine 100 average everyday people are looking at buying a smartphone. How many do you think are really going to care about being able to do all that in a singular swipe that saves a few seconds? Calling and texting on an iPhone is equally simple, and how often do you really need to adjust the brightness or toggle things like bluetooth or auto-rotation? I don't know about you, but I don't do that stuff frequently enough to really make that a plus in favor of Androids. The iPhones are amazingly simple to use and require pretty much zero user maintenance (like killing background apps.) Out of the 100 average people, I'd wager about 90 are going to pick the more polished, smoother, and easier-to-use OS over the more versatile, but also more complicated, one. There's a reason why the iPhones are insanely popular, it's "advanced technology" (think of that what you will) that your grandmother can pick up and use.
Not to mention, it's not as if navigating menus on the iPhone is a chore, it's about as straight-forward and simple as it can get. Settings -> Brightness -> a bar that you move back and forth. Settings -> WiFi -> on/off. I know people who've never picked up a cell phone in their lives before that would have no problem using one. There's no feature that's difficult to navigate to, tweak, or get used to.