OK.. Hmm..
@OP.. That's alot of info to digest..
/reserved
And it's 7 pages down...
Initial Thoughts:
I think the current problem with the Armory system doesn't stem from the system itself, rather the perceived roles and abilities that certain classes/jobs/whatnot should have.
People define the Guardian as the "Tank" because they are the only melee class with the ability to equip a shield, not because of the abilities they get. Arguably, marauders make a better tank (at least earlier on) because of defender. Theoretically, I could make a Marauder Tank with the proper abilities and traits from other classes; quite easily actually. I know this is what you're changes are supposed to facilitate, but I believe that the current system facilitates it just fine.
The issue you speak of goes away if people ask for a role rather than a class when looking to fill a spot in a group. Technically, with the armory system, I could make a Guardian whose role is Healer and do just as good as a Conjurer if played properly (made easier now by auto MP Regen out of combat).
Honestly, the Armory system is the absolute LAST thing I want SE to touch. I'd rather them fix things that are obviously a decade behind the curve in MMO technology than change things that may very well be "next generation" and completely misunderstood.
From an equipment perspective:
Rather than defining binary boundaries between what gear each class can equip, they defined a set of rules that modifies the attribute bonuses granted based on how well mated a piece of gear is with the class that has it equipped. This follows along the lines of.. yeah, a mage can wear plate but his spells might not be as effective, or that a Tank could wear cloth, but not get quite the protection expected from a full suite of plate. That's not to say they don;t have other abilities to compensate.
XIV is not complete in this regard, however, there is a definite uniqueness offered by the Armory that is absent in just about every other MMO I have played. To bring in buzzwords.. The Armory system is a very sandboxy trait in an historically theme-park based IP.
I'd rather they expand around the possibilities of the Armory system before limiting it to humor more conventional approaches.