Many didn't have the issue before. There are more ring options now than before, to include the class rings for battle, crafters and gatherers.

I talk about the class rings as they are specific and we could see more like them in the future instead of "casting, aiming, maiming, etc". Maybe even future AF related. "Valor Ring"

Just straight simple math.
This is no classes or jobs sharing rings. A single gear set for each one.
Battle jobs: 9 x 2 = 18
Crafting & Gathering Classes: 11 x 2 = 22
Total rings: 40
Total Armory ring slots: 25

All other gear slots, nothing shared Total: 20ea
Armory slots for the other gear slots: 25ea

5 spare armory slots available for all gear slots but ring.

I didn't add battle classes since most lvl30+ are on jobs.