Without knowing what the explanation is, it is hard to say. I have certainly witnessed (out in the world in general) warranty repairs that didn't help at all, in which case knowing beforehand might be useful.

Anyway, I think from a PR perspective - in this early adopter, community stage - respecting the community enough by giving them an honest, solid reason when something like this happens just smacks of good policy to me. The secrecy in that TJC thread doesn't sit too well with that.