15 handtraps should be the new target once Fiendsmith comes out ?

Since we basically need to be drawing 3 handtraps to deal with every 2 cards (starter + extender) that can be linked off into moon then requiem, is 15 the goal when deckbuilding or is 12-9 still enough?

obviously talking only about decks that can afford to run that amound of non-engine in the first place. (ie. every meta deck)