Actually, this is not such a bad idea. I remember back in 3.5 days many folks were wanting to run old 3.0 PrCs- even after all the 3.5 “splatbooks” has come out. My question was when does the fact that you have NOT redone a PrC mean that it is dead or dropped. Andy was nice enough to respond to my post saying that yes, they need to come up with that list (and that yes, those PrCs were dead), but then 4th ED happened.
So, there are not critical but still unanswered queries that should be answered, like what happens to a eidolons gear when it dies?
Instead of a FAQ what would be nice is a list of “not official but still good” answers from Devs on such questions, like the one Cheapy linked to.