In Endwalker, BLM could remove 4 buttons, without affecting the playstyle whatsoever because some spells can only be cast in Astral Fire or Umbral Ice and so could be on the same key that switches depending on the buff:
- Fire IV and Blizzard IV (this could already be the case in Heavensward);
- Despair and Umbral Soul (same but with Shadowbringers);
- Freeze and Flare (UI/AF requirement is new starting in Endwalker).
Furthermore, there is no reason for Between the Lines not to replace Ley Lines when it is on.