Honestly I wish they didn't make more subbable spells. RDM needs job identity. It'll depend on how potent tier 1 is vs tier 2. Because so far tier 2 debuffs have not made a significant impact on desirability. If a BRD or COR can just sub RDM, they might be more beneficial because they can add some evasion down/ranged attack speed while still providing other buffs.
I'm holding out to see how the update unfolds when we learn the values, but I have to say I was a bit disappointed to see more subbed (shared) abilities.