In Endwalker, Sage was added as effectively a completely new job concept alongside Reaper, yet it has failed to live up to the job fantasy it was given. In its teaser debut, Sage was described as a barrier healer with an emphasis on DPS and a response to the ongoing requests for more DPS spells on healers in Shadowbringers. To compliment this idea, Sage would also be able to provide healing through its DPS, yet the execution of this concept in PVE has failed to stand out against its alternative barrier healer--Scholar. It's only in PVP where the job fantasy of Sage has any tangible presence in the job's gameplay.

The Issues

DPS
Sage's DPS kit is as painfully shallow as the rest of the healers' DPS dominated almost entirely by spamming Dosis which was the main point of contention that Sage was supposedly trying to correct. A 40 second GCD cooldown does not magically fix the issue of having almost nothing to cast most of the time, and Psyche has done nothing to change this either. The Addersting system is painfully mid as well. Toxikon is meant to be an uptime tool for casting on the move, but with the only method of generating more attached to GCD barriers--something a half-decent Sage rarely ever uses, it's an incredibly lackluster method of preserving uptime that fails to help diversify the sea of Dosis spam that Sage is otherwise saddled with. There is no universe in which this is an adequate play style for the people begging for more DPS options on healers.

Healing
Sage has two very ownable and interesting methods of healing. Kardia which sets a semi-permanent target to receive healing with every attack spell Sage casts, and Eukrasia which changes various GCD spells into different spells. Unfortunately, Kardia is an entirely passive system, and Eukrasia's augments are outclassed by OGCD healing. Both are greatly overshadowed by Addersgall, which is nearly a 1:1 copy-paste of Scholar's Aetherflow. So rather than heal with its own unique healing style, Sage often feels like a watered down Scholar with less nuance.

The Solutions

DPS
Sage needs to level up its DPS arsenal. It should feel more like a mini-DPS that also heals. That was the entire point of releasing Sage to begin with, so it baffles me why it does almost nothing to differentiate itself from the other healer's painfully dull DPS gameplay. Make Sage feel like a caster DPS lite. Take inspiration from Red Mage and/or Pictomancer if you have to. Diet Red Mage or Diet Pictomancer with added healing, if you will. Rework how Addersting is generated and/or what it's spent on. Give Sage more regular spells to cycle through as something that isn't just a generic combo.

Healing
Sage's main methods of healing should be redirected to center around Kardia and Eukrasia. These should be my go-to, most optimal methods of healing anytime the party takes a raidwide hit. Other actions should be supplementary and exist to support Kardia and Eukrasia when they aren't enough, such as tighter healing checks in Savage or when your party messes up. Consider reworking what Addersgall is spent on. Instead of Aetherflow reskins, why not spend it on actions like Soteria and an actual Pankardia that triggers off your DPS? Make it support Kardia healing rather than replace it.

The TLDR
Sage was sold as a DPS-focused healer, but its DPS is no different than the other healers, is severely boring and fails to live up to the exciting expectations of an attack-based gundam healer. And the token healing methods associated with Sage are greatly outclassed by boring reskins of Scholar healing. These need to be changed going into 8.0 so that Sage can live up to the job fantasy that it was assigned, but failed to live up to.