I agree that SGE seems to be their way of "accepting" DPS healer philosophy and there's evidence of good design in its kit, even if it's surface level.

Your bit about Eukrasia is interesting but it's really there as a way to save button space and give it a unique flare I suppose. To be it just feels like a practical SB Dark Arts SPAM without being too annoying. I don't really see them changing it though unless it effects oGCDs.

Rhizomata can stay oGCD but I do like it giving 1 addersting as you can use Toxicon for actual movement.

I personally can't see them adding more damage spells for SGE without the community busting into flames over it having a more engaging rotation but Idk I was shocked when they created Kardia so who knows.

As for Kardia, I think it's fine and even Soteria is fine. It's not meant to be the sole healing for tanks, just a reward for being able to balance oGCDs while dealing damage. I think Eukrasia can turn Soteria into an AoE spread of Kardia for a short duration with the same 90s CD. This way you have a choice between using it for MT or party sustain.

I personally like the animation for Holos but I hate that it's 120s when it could be 90s. It's meant to be a long-term mitigation tool.

Haima could be a 90s CD tbh since it's main purpose is for sustaining constant autos.

This is more of me thing but I find that Krasis is cumbersome to use as you need to apply it on a target before the skill to get the boosted healing. This requires weaving into tabbing to your ally and then weaving using the skill if you don't have a double weave window. Perhaps it could just increase the potency of healing on single skill used on the next target automatically or boost AoE healing action for half the potency.