I know there's another post on this forum from prelim patch notes that got sh*t on.
But the official JP Patch Notes are up.

コンテンツファインダーによるマッチングを使用しないコンテンツ
（機工城アレキサンダー零式：起動編など）

クラス／ジョブの重複に加えて、同ロール（TANK／近接DPS／遠隔DPS／HEALER）が3クラス／ジョブ以上いる場合に、リミットブレイクゲージの蓄積が遅くなります。各ロールの該当クラス／ジョブは以下の通りです。
It specifically states it will AFFECT Alexander Savage.
(No need to argue over the semantics of "dungeon" vs "raid")

So there's that. Attention needs to be brought to this; how it adversely and unnecessarily affects specific statics.

The playerpool capable for A4S is already small, and this WILL screw w/ statics (including mine: blm+smn+brd) who attempt to use the Sac method.

The Sac method is legit as far as SE is concerned, now double casters groups are screwed out of a Healer LB3, whereas double melee groups will be fine - wtf.