It is much safer, plus it's a lot easier, in the long run, to mix-and-match combinations of bootloaders, radios, and os. If they were all packaged together every time, you would not be able to things like install the 3.35 radio with the Alltel os, etc (not saying that this is anything you would want to do, but just in case).
It is much simpler to run an unlocker, radio flash, and then os, then try to break out all three elements from the nbh, and then rebuild the package with the ones you want - although that is still easy with the tools available here, just not as
