The iPhone Duo is the riskiest Apple product in years. It's a huge rethink of what an iPhone is and could be, and it contains the seeds of many fascinating ideas that might be great in the future.
But that future is yet to come. The iPhone Duo is also one of Apple's messiest first-generation products in a long time, and right now it will delight gadget nerds and early adopters and likely frustrate everyone else.
It's been a minute since the iPhone has looked or worked significantly differently. The last major change was the iPhone X, which dropped the home button almost a decade ago, and even that was a fairly subtle improvement. In fact, …