Not that I'm against this, but it still wouldn't fix the issue of Unique Rings than you can only possess one of. But If you only count DoW and DoM there are like 12 Jobs total with some overlapping, Mainly Tanks, Healers, and Bard/Mechanist/Ninja so taking that in there would be like 5 ring classifications, two rings each.

But Ten Rings you have to lug around all the time is half that inventory so when you carry around you 2 crafter rings and 2 Gathering Rings it starts getting a bit cramped. Then you just run out trying to get BiS gear which take up the extra. And then that's all assuming you have 60s across the board.

Long Story Short
We need more Armory Chest and Inventory Slots.