I cannot see how this posting helps to know more about the Apple Watch ?
It doesn't. And I do not see how any other post helps. The iWatch is still a product in development (especially in what regards its battery life), as I can see, and nobody actually had access to it apart from people who attended the Keynote. Everything else is just speculation.
However, despite the fact that nobody actually knows exactly what it feels like and everything it can or cannot do, people are already forming very strong opinions on it. Some will definitely buy it the day it comes out, some cannot even think of that.
And yes, nobody really needs an Apple Watch and nobody really asked for it. It may end up being a good and useful product, but Apple is still neglecting a good part of its users, especially Mac users. I can see there are still some orphans of iWork and Final Cut Studio (no, I use none of them), and Apple is not showing them any reason to stick to their Macs.
Instead, Apple is diversifying and trying to reach people that do not care at all for technology. It is fashion industry now. Lots of people are going to buy the Apple Watch because it is fancy and because it is a wearable made by the king of brands Apple. Luxury brands, beware. A lot of these users, perhaps most of them, will care about the wristbands and the watch "faces" and will not care for what it can or cannot do. Apple will focus on squeezing this market and will let apps to be developed by third parties usually small developers who have not the money to make software that Apple would be able to make with its tons of money. The result is that Apple will make more money with more superficial products and will end up alienating its core user base of yore computer geeks who want their devices to actually make things.