SE, don't overthink Summoner 7.0. Just give people what they want. Just do it.

[Renathras]

...

I do like the idea of him being a support, but some things:

1) Searing Light is originally Devotion, which was native to Bahamut, not Carbuncle, I believe. They changed the name but the effect predates it.

2) Is interesting as an idea, but bad with the crit RNG and two minute meta stuff. It's basically the Double Down problem on steroids. With the potential for this massive attack (even 50% of the damage the Summons cause could be several thousands of potency as each one is 750 of damage on the summoning and another 1,920 [Titan], 1,500 [Garuda], and 1,880 [Ifrit]. Suppose you used this with all 3 gems active. At even 50%, that would be a single hit of 3,775 potency. 7,550 if it was 100%. Imagine the difference between crit direct hitting a 3,775 potency attack vs getting neither crit nor DH from it!) making the SMN's DPS potentially swing wildly. There might also be meta builds that are designed around dumping it in burst windows because of the potential gains in potency unless the penalty is stiff, in which case it becomes an extra button we have but never use except in extremely niche situations, which contributes to button bloat with no really good outcome.

3) This one could be OP, but is more interesting. Though I also feel like Phoenix should be doing something like that, not Carbuncle. In many of the games, Phoenix does things like party-wide Full Life (which arguably means it should be a LB...if SMN was a Healer, I guess) or regens, while Carbuncle's power is almost always party-wide Reflect, with some games (like FF9) allowing this to be converted to Protect, Shell, or ...I think Haste was the fourth effect Eiko could generate with him.

.

The reason I'm a fan of the Ruin 2 thing is so that he's not just...standing around waiting for something to do. That's like a Healer that only casts Cure on people and, when no healing is needed, doesn't chaincast Glare or whatever, they just stand there. Waiting. That's even worse than the Cure 1 spammer or Regen/Medica 2 caster, since they're literally doing nothing. And that's what Carby is for almost all of fights now.

I disagree with taking Res away, though. That would have much farther reaching impacts in the meta, and it's one of the reasons I like SMN and RDM. One thing I HATE more than anything when playing a DPS is when the Healer (4 mans) or both (8/24 mans) go down and no one else in the party can do anything but watch the party wipe. It's explicitly why I only play SMN or RDM when not playing a Healer/Tank, and why I don't play other Jobs as my go-to DPS. I like MCH and I like NIN, but I hate that feeling of powerlessness in encounters like that, so I stick with the ones that aren't powerless.

EDIT:

You can help healers heal, but it shouldn't be done to make up for their lack of skill, it would be unrewarding and quite humiliating for them.

I will NEVER understand this mentality.

If a Healer or Tank is DPSing, no one worries that the DPS will feel emasculated. After all, the Healers/Tanks doing this are telling the DPSers "you aren't good enough to clear the dps checks without my help...". And...no one cares. In fact, doing this is PREFERRED.

I've never, as a Healer, at ANY time, felt "humiliated" if DPS or Tanks throw out incidental heals. If it's at a time of the fight the extra healing is useful and just reduces the pressure on us Healers, I'm not going to complain. If it's at a time when it's kind of useless, then it doesn't matter, and I'm also not going to complain. If it's at a time where we can't likely keep everyone alive without it, then I'm thankful, not humiliated.

It would take being a pretty egotistical, arrogant, and prideful Healer for one to complain or feel "humiliated" about such things.