My problem with this is just a repetition of problems that other people have with long term engagement with the job. Doing as you have said which is already been mentioned several times is only a Enkindle recolor. Yes, you can summon the other 3 main summoners of the franchise. The problem is it's literally a copy/paste of the same rotation with no real change in interaction. A glorified VFX job and no substance.

If you wanted another opinion on what they could do? Fix the Arcanist elements of the jobs (Energy Drain, Fester/Painflare) and give it the mechanical interaction to upgrade the given summons to higher summons.

They could also give us a separate trance that can be used between Demi's to would allow higher summoning in between.

I know a lot of people want more summons. But just slapping on more Ruin recolors and Enkindle recolors, without actually making any change in how the player engages with the job to obtains these in anyway and only repeating the same rotation only leads the jobs stagnation. Especially if you're implying there would be no change in the rotation going into 7.0.