I had the Atrix 4G on ATT when it first came out... back then I was disappointing when the lock BT.
2.5 years later, Moto still locked this BT due to ATT; but this time I was not disappointed; and rather prepared it would never be unlocked by devs... but im okay with it
why?
because for me, I just wanted a stock experience, and the Moto X is stock as far as I am concerned. A small bit of bloatware, and I have to see the annoying icon... but the phone is fast. I think most people wanted to root because to get away from Sense, TW, and Motoblur.... and the Moto X has no custom loader; thank God.
But if a locked BT is that big of a deal for the purchaser, then get a T-Mo verison/ a DEV edition, or wait for the next Nexus device.