Considerations altogether:
1. MP/TP Songs no longer have DPS cost.
2. MP/TP Songs may now be forgone via the inferior Mana Shift and Goad caster/melee role skills, but each would require multiple inferior carriers for each instance by which the Songs would be necessary and were skipped.
3. Whereas in progression Protect will be necessary for one healer, and Esuna for another if not both, and Largesse, Lucid Dreaming, Surecast, and Swiftcast for both (Eye for an Eye or Cleric falling next in priority), and Diversion, Invigorate, Feint are obvious choices followed by either Ranged coverage through Goad or Healer coverage through Second Wind or Bloodbath, Ranged jobs only really stand to gain a redundant Bind, Heavy, Silence, or Stun by dropping Tactician or Refresh. If raid designs follow similarly to of late, none of those Ranged alternatives will be of use.

While I, too, would prefer native versions for a sense of uniqueness, I'd have to point out that as tiny an option as they are, they are at least still an option (like most other roles, only as optional as the cross-roles were before, but now with a few obligatorily swapped out per fight instead of seeing broad use).