> In that scenario, it is easy to see how an expensive watch that replicates smartphone's functionalities would be a commercial failure.
I've thought about this problem for me personally and agree that I definitely don't want all four. I'm fine with three of them, though. In my case, I've decided I'd actually much prefer a smartwatch over a tablet, in the sense that I think a tablet is actually more redundant on top of the phone than a smartwatch. I've actually completely lost interest in tablets over the last year or so.
I had a Moto 360 and there were moments when I felt a glimpse of the genius of a smartwatch. The rest of the time I was frustrated with the incredibly laggy interface, the pixelated screen, the flat tire at the bottom, the general massiveness of the watch, and the extreme unreliability of the fitness tracking options. From what I've seen of the Apple Watch, it's a huge step forward in terms of basic quality, both hardware and software, but I'd have to switch to an iPhone to use one.
The Pebble Time has a quirky appearance, but it looks great in terms of usability and software quality, so I'm definitely excited to try one when I can get my hands on one.