So here is basically what this redesign actually did.
- It removed Bio and Miasama along with Bane
- It removed Egi pets
- It removed FWT single target & AoE combo
- It moved Egi Assaults from the pet to the Summoner
- It moved Egi Enkindle from the pet to the Summoner
- It added a nice looking Primal for about 3 seconds
- It added Demi 1.5s Auto Attack
- It didn't add any new primal summons to the job

This redesign only served to fix common complaints from 5.0 yet it ignored what was actually good in 2.0, 3.0, 4.0 and 5.0. That is the crux of the problem.

Let's take the first issue, the removal of Aetherflow from the job (Sorry but Energy Drain isn't Aetherflow). In 3.0 and 4.0, Aetherflow served as the setup for your rotation. It allowed for AF abilities to charge your Trance which in turn charged your Demi. Aetherflow should be used to add Elemental Arcanum. Using all three in turn would charge up your Trance/Demi.

Let's talk about Egi pet removal. Was it really needed? Wouldn't people have been happier to summon Garuda Prime, have her stay and auto-attack in a manner similar to that of a Demi? You'll still be summoning one after another but they'll do a little extra damage while you go through your Elemental Ruins (Egi Assaults).

While on the subject of Egi Assault or more to the point, Pet Action Removal. In 2.0, 3.0, and 4.0; pets had 4 different abilities then 5.0 reduced that to just two. In 6.0 it's still just 2 which make it feel super light in terms or abilities and unique playstyle.
FFFXIV Battle Design has 3 basic sources of damage; Global Cooldown (GCD), off Global Cooldown (oGCD), and Damage over Time (DoT). Summoner offers two out of the three yet gives you three different Elemental Arcanum.... A better design would be one element to focus on GCD, one to take a oGCD weave design, and one use a DoT design. Now I mentioned earlier how pet actions went from 4 to 2 but I feel 3 would be a good fit in 6.0.

Trance/Demi also feels off now. In 4.0 Bahamut would attack when you used a GCD or a oGCD action. In 5.0 FWT was a 1 & 2 combo. Now both have been dumbed down to 1 Single and 1 AoE. Everlasting Flight/Rekindle are nice but require a rotation rather than on demand use. Making Demi auto attack did fix the problem of Demi's "ghosting" Enkindle but both need a unique playstyle. I've long said during the 5.XX cycle if Demi just Auto Attack, there should be a trait were any GCD or oGCD has a chance to change Bahamut next auto attack into something stronger. Also change Akh Morn to GigaFlare since it is his signature move and the fact that Deathflare is Akh Morn. Also DWT should go back to GCD spells.

Ruin and Tri-D are basically useless since you'll only be casting Arcanum Ruins. A better option might be oGCD. We could remove Fester and ED/ES then just have Ruin IV, Tri-D, and Painflare as oGCD with some kind of charge mechanic.

Speaking of mechanics, SMN needs some to make up for all that they lost. As I said eariler, AetherFlow > Arcanum (AC) > AC > AC > Trance/Demi is feel good but needs more. Plus we are still missing the summons we were promised for over 7 years now.
We need an Astral Cycle and Umbral Cycle. During the Astral Cycle Aetherflow you'll have access to Ifrit, Shiva, Garuda (Fire melts ice, ice block wind, wind blows out fire). When you cast the elements in the right order you'll do bonus damage. The Umbral Cycle will be Leviathan, Ramuh, Titan (Lightning strikes water, Water erode earth, Earth ground lightning). An other key fact is that you'll get access to use either Astral AF or Umbral AF (2 different Abilities) to build up 2 different Trance (2 different Abilities). This should help with death issues and complete lose of a rotation plus give the Summoner more flexibility on when to use said trance.

Another new addition would be complete both DWT and to unlock a new Summon that would be your quick 3 second Primal Enkindle Animation would be either Odin or Alexander that does are straight line attack, since that is SE flavor of the week for this Expansion.

As for Searing Light and Aegis, I'm not sure why SE can't just make it a Carbuncle Spell Animation but that is what it should be so you can cast it at anytime.

So to summarize the rotation would be:
(Astral AF > Fire, Ice, Wind > DWT/Bahamut) + (Umbral AF > Water, Thunder, Earth > FWT/Phoenix) = Straight Line Primal Enkindle (Odin or Alexander).
One GCD Arcanum (Fire & Water), one oGCD Arcanum (Earth & Ice), and one DoT Arcanum (Thunder & Wind).
Three charge oGCD (Ruin, Tri-D, and Painflare).
Searing Light and Aegis independent of pets.