True but expect accelerated wear of the bearings if the faces are not parallel.

It's overly optimistic to expect all new frames to be faced and I've found un-faced BB shells on new bikes already fitted with outboard bearings. Surly frames do seem to face the shell, at least on the ones I've worked on. If you are going to change a square tapered BB for outboard bearings (and I can never understand why anyone would want to), then "a pennyworth of tar" comes to mind.