The somewhat substantiated rumors posted on
http://www.howardforums.com/ claim that T-mobile will be adding some new phones sometime in March.
My observation about crappy phones from US cell companies is that the US in general gets second rate phones in relationship to our European and Asian counterparts. Next, I think that the history of cell use and the difficult time that cell companys have had gaining new-to-cells users in the US market have forced their strategy to focus on low price phones and plans. Last, I think that the majority of US cell users are second rate users. They want a phone to make and receive calls on when away from home and office. The cell is definately an addendum, not an alternative. That's why we get cheap, featureless and styleless phones.
My unresearched opinions only. Can't substantiate any of it other than the fact that the US gets less cool phones than Europe.
FWIW I'm about to import a Nokia 6230 to use on T-mobile. Looking forward to Bluetooth.