Agreed!

My current pain point with FFXIV, is abandoned content.

BLU mage is an example of this.

The community overall likes BLU, even in current limited form, but we have not seen updates.

As designed, BLU is suppose to be "holdover content", ie content you can play while waiting for newer content.

Well, we're in a holder over period now.
Please expand BLU to deep dungeons.

Even better, allow BLU into any party finder instance where all players have cleared the content.
Do not need to add BLU gear; simply being able to learn instance abilities is enough.