Not sure what ilevel weapons you get from Sephirot Extreme, but the crafted stuff is i220. The Lore tome weapon is i230. Sephirot Extreme weapon can be obtained as soon as one can start farming it, but the Lore weapon takes 7 weeks of Midan Gears from a8 normal.

To me, that means there would be room for i220 crafted weapons with i230 Sephirot Ex.

Of course, Bismarck Ex weapons were irrelevant the moment they went live. So they would not need to ensure Sephirot Ex weapons relevancy if they don't want to.