Indeed. Just look at Scathe - same purpose for BLMs but the damage loss is so significant (being unaspected means it inherits no bonuses from AF or UI) that it's hardly worth it to use, especially during Astral Fire when total MP is finite. Besides that, a mastery of Triplecast and Swiftcast has historically proven sufficient for the same purposes most of the time, and ShB's additions granted them even more instants to push away from Scathe.

In our case we may not have Triplecast, but we do have slide-casting, Dualcast, our existing melee skills, and slightly greater overall mobility than BLM. Reprise was never necessary or even particularly appealing for on-the-go damage for RDMs.

What was appealing was its potential as a means to cheaply dump Mana from a distance that was in danger of overcapping, either due to RNG or plain being unable to reach the boss once you got over 80/80 Mana. But if it's less of a loss now to just overcap your Mana, then we'll never willingly touch it.