I am genuinely open to minded about those reasons. Apple has a reputation of putting some functionality in different products that other Apple products don’t have in order to not cannibalize each product line by allowing consumers to “have it all” in one product (some products have better screens, others have power, yet others have USB ports, but none have all features that customers want). I am therefore expecting the watch to have something that the iphone doesn’t have. I have yet to hear of one even though I would expect that working out with an apple watch is easier than with an Iphone. If someone can make a major purchase for that small a period of time (even though a cheap tiny mp3 player could do the same), then by all means the watch would make sense.
The Watch’s advantage: size. Untethered, it’s a 1” iPod Touch. Leveraging a nearby iPhone, it’s an iPhone Nano.
My own increasing complaint about the iPhone is _size_. It’s too big, and getting bigger. The 4 was fine. The 5 is a bit bigger than I want. Needing an upgrade, there’s the even bigger 6. The 6+ is so big I won’t even consider it. They’re getting large enough that my pocket, prone to carrying other things, is too small.
Strap an iPhone Nano to my wrist, though, and it should resolve the hassles of the growing “phablet” format. My iPhone, whatever the size, will still be nearby (and here’s hoping it will pair with the iPad soon enough; if I’m going to haul anything around as a “base” I’d rather it be the tablet).
Don’t underestimate the hassle of “digging the phone out of my pocket”. Flick of a wrist, get to do most/all of my “quick check” actions (time, phone, weather, location, etc). The Watch handles those “quick check” actions very well ... and, as not everything need be cellular-connected always, the Watch will do much of its basic actions without the iPhone around all the time.
For those of us buried deep in the Apple ecosystem, it makes sense.
(I just wish those for whom it doesn’t make sense, starting with not having an iPhone, would quit acting like they’re being compelled to get a Watch anyway under threat of imprisonment.)