There is debate whether a question such as the following should be allowed on this forum: Outside or within remit - should a BDD scenario be created for this user request
A key reason why it should be allowed is:
- This question is about testing, because "deciding whether a requirement derives from a mission statement (a.k.a story or epic)" is in fact a core part of BDD, and BDD is testing. The disagreement probably arises from an overly narrow definition of testing, which is and should be seen as more than the technicalities of unit testing and such.
There are more (independent) key reasons for not just allowing but embracing such topics, but the above should be sufficient in my mind, so I will not go into the others.