HTC HD7 / HD7S
1. Set minimum specs and features, so all Windows Phone devices deliver a "premium" experience.
2. Simplify the platform by standardizing the hardware to some degree.
That second one is where is get tricky. In theory, it's a good thing, but it can have negative consequences as well.
You see, a big part of what slowed down Microsoft Windows Mobile (5 - 6.5) development toward the end was that they had to support a large number of different chipsets, screen sizes, etc. Plus each carrier had their own customizations and testing process. It really bogged things down. Standardizing on ...