The classic summoner identity in the FF series is long suspenseful cast times, but for the best flashiest burst damage in the game. So I think this an opportunity to finally shed the rez like they always wanted, and for summoner to fully lean into a black mage equivalent DPS identity. Black mage being more consistent/constant sustained damage, and summoner for the BIG big burst. In pursuit of that I think they should even get rid of Searing Light, personally. Never really made much sense, them having a generic party damage buff. But I have always hated summoner having a rez in particular since it thematically makes little sense, just like the poison DoTs (compounded with Physick never being viable) . It could still have DoTs, just not poison-related ones. A rez, however, seems to me as thematically AND mechanically not something a summoner really ever had a logical basis for having, and them having it actively hinders them allowing it to reach its full DPS potential in the job balance dynamics. Unless it something tied to the conditional narrow window of being in Phoenix phase, of course, or something like a preventative Auto-Life. Therefore, I think Resurrection should be not an arcanist action, but specifically a scholar action, and the Phoenix rez (if they get one) should be learned at level 80 when you learn how to summon Phoenix (also putting red mage as the earlier learner now, and the primary star of the DPS rezzer show).
As for a solution to the red mage rez tax, how about it gets a stance sort of like in PVP but more like astrology's old sects that you can only change before combat starts, which gets rid of your ability to rez in favor of balancing you closer to black mage. Replacing the Verraise action with something DPS-related. Black-attuned versus white-attuned. In PVP, it gives you the choice between Magick Barrier or Frazzle. Just don't have that circle effect on the player constantly visible, it's utterly obnoxious. Personally, I like the idea of red mage being the only DPS rezzer since they are the only ones who deal with white magic. But giving them the option to not be confined to low DPS because they are the rez mage, that denies them their rightful claim to black magic identity as well, so this stance gives players and raid groups the option of if they are relying on them for their rez, or if the red mage is permitted to have their DPS fun as an equal to the other casters.
As a black mage main, I am fundamentally against black mage EVER getting a rez of any sort, since it is not just thematically irrelevant, but thematically and mechanically OPPOSITE to everything black mages stand for. It would clash with their entire design and gimmick, even if they got some sort of evil necromancer rez. I would like them to have Mana Shift back though...