Things change slightly when Cymbi guarantees all the other members of her squad to do a special on the first turn (she still has a ~1% chance to not get her special herself though), including Fritillaria, who gets buffed by every special preceding her. I can hardly wait for Nutaku to either add a rumoured buff to Nerine (raising her trigger buff to max 1.32 instead of 1.2) or Fritillaria getting a bloomed form (giving her the trigger rate buff as well), so Cymbi gets that last percent to her guaranteed special as well.
So Cymbi is support-cast, but it completes the play.