That looks Amazing, lots of great Ideas! I never played XI so I don't know how it worked for it :x but I would like If they add and separate Summoner and Primal Skills differently with each of their own Sets. Summoner Skills is just like other Class Abilities/Skills while Primal Skills will change depending which Primal is Summoned according to the Saved Set.

I.E
When you Summon Shiva, the Action Bar's will change to Shiva's Set which can be modified at will and will only affect when you use Shiva. When you summon Ramuh, the Set will change to Ramuh's Set, so there will be no need to re-set/change your Action Bar Skills or consuming much space for the Action Bar so you can focus.

Shiva Set
|Purge|Refresh|Blizzard III|Freeze III|Ice Spikes III|Diamond Dust|

When you change to Ramuh, the Action Bar will also change and adjust.

Ramuh Set
|Purge|Refresh|Thunder III|Shock III|Shock Spikes III|Judgement Bolt|

I reckon they should also add this since they're also doing it for Point Allocation/Attributes and I also hope they're doing it for Classes too.