The worst part of SMN at level 100 is Seering Flash being a follow up to Seering Light.
In Endwalker, if you had more than one summoner in the party you could delay seering light so they didn't overlap and waste the buff. Now Dawntrail makes that decision a DPS loss for any summoner who delays their seering light from other buffs.
Please move it to Solar bahamut or something else. Maybe even make it its own button.