First of all this is not a personal dig at you or your opinions, your entitled to them however the approach you are suggesting is just wrong lol. Let me explain.
I think Metro helped a lot in promoting flat design in UIs, and removing useless chrome. In general, It's a beautiful design language, but It has many problems:
The use of typography and white space to differentiate the function of the text is not a good idea because space is scarce in mobile devices.
I think Metro was optimized for getting glances of information during the day, like traffic signs, easy to decode with just a glance. The problem is that smartphones became much more than that, in many cases It's the most important computing device for the user. People use them for complex tasks, want to see a lot on information, people got used to work with more information density. So, Metro is out of tune with the current usage pattern of smartphones.
So you would prefer if everything cramped was into one a single space therefore requiring more focus. If anything the Metro typography is perfect for phones as it is clear, easy to read and navigate.
Oh complex tasks... you mean this right?
wait I need to jump out of an app to do something,
then go into another do something else
and I need to hold a button, scroll through the icons,
find what I was using or close the other apps..
It took Apple to get to IOS 7 to get a decent task switcher. Whereas Windows phone had it since 7 (3 years prior, however the back stack was too confusing) and I'm well aware both took a few pages out of WebOS.
They have to incorporate color as a way to differentiate functionality, instead of white space an typography. Increase the information density. Incorporate esthetic elements over boring but easy to read elements, the smartphone user choose a delightful UI over an boring/easy to read UI, specially when buying devices.
Increase the information density??
Bombarding a user with too much information in a confined space is far too overwhelming, especially in this day & age where people's attention span is no more equivalent to that of a goldfish.
Information needs to be displayed in a clear, crisp and concise manner combined with images or animations not sugar coated in candy fluorescent colours (some people are colour blind). Perhaps you have been playing too much Candy Crush :winktongue:.
Other problem is the layout of the UI elements, It's so weird, unfamiliar, unexpected. I think they optimized single handed use. But single handed used is just impossible anymore with the big phones that people prefer today. Because, again, the smartphone is not that small accessory anymore, It's not a pager, a BalckBerry, It's the main content consumption device according to stats.
So what about the ios layout on the 6+ how does that work for you?
If anything people are too accustomed to tapping for information instead of reading, the UI is not unfamiliar or unexpected - people don't like change and are far to focused on what they are comfortable with.
I wouldn't say it is obsolete, just diluted by the demands of users who want it to be IOS / Android-esque.