Wp7 is perfectly matured and much more so than some bigger operating systems.
Would you mind to be more specific around this?
Let's take a simple ,yet very important feature like changing the font size. Wp7 that is "perfectly matured and much more so" doesn't have such a basic and important feature. For sake of valid argument, Android doesn't have it and doesn't even seems to care to support it. In contrast to some matured operating systems like for example: Symbian, Blackberries and even good old Windows Mobile support this.
It's focus group is just different than some. I mean as far as things like UX go it's infinitely better than android, meego, maemo, Symbian, and pretty much anything short of iOS.
Well, yes Wp7 is so much focused on certain group rather than it being adaptive to people needs. More like "Its my way or the highway", Android customizability & Symbian seems to wins in this part. In terms of UX it isn't accurate to claim its infintly better, which means in future it can't be even enhanced (you knows its inf+ better). UX is more than personal preference, however it doesn't seem so much particle for everyday uses. Specifically for people who cares more about getting their jobs done rather than wasting their time.
The integration or "peoplecentric" of all things social is second to none, there is no concern for lag, even on hardware that is two years old (a veritable lifetime in the mobile world) and the integration with things like Xbox, Microsoft office, and Zune provides a media experience that I find tough to see anyone rival.
So, if I don't have a facebook , twitter or other social accounts I am being left of enjoying this experience or going to effect it? seems not good at all. About the hardware ("Snapdragon QSD8X50, MSM7X30, and MSM8X55") as minimum requirement they aren't minimum at all. Sure with using capable hardwares (more likely to hide its software flaws and requiring less time to code & optimize) so you won't find any lag . I can't talk about Xbox & Zune at this point. But, with Microsoft Office, sure its useful and having official support is better than none. You need to be aware that there are alternatives for almost all you mentioned and it can be integrated with other OS's as well. Like Skype which Microsoft acquired is not only limited to Wp7.
Wp7 is the first OS I've used that is an absolute joy to use and everything is so dynamic and lively that going back to most other OSes is painful. Nokia doesn't want a second-rate android. They want something new and outstanding.
Glade you find your source of joy, still Meego (linux) & Symbian had potential that Nokia wasn't capable of showing it.
Anyway, I am off to sleep. Good Night/Morning.
Edit:
@MartyLK, I will reply to you latter