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Thanks for the feedback and awesome idea!
Initially, I did want to pitch this concept as a new job class (since I do honestly believe it could be fleshed out to be a unique form of a combat style), but I figured that would be far more ambitious for the upcoming expansion than simply creating the weapon itself to be used by all the current jobs that would get the most out of it's play style. However, that doesn't mean the Devs couldn't create a history around the weapon itself upon implementation that speaks of a lost warrior class that used these unique weapons primarily in battle. Heck, I'd be ecstatic if a new type of beastmen in the expansion lands still prefer to use this possible "weapon of old".
Honestly though, aside from the cool factor of dual-wielding two "death spheres" in battle, if the Dev team did invest the work into bringing this weapon to life in FFXI, it would kind of behoove them to put their own wonderful style and flare all around it as only Final Fantasy developers can. If that would mean a new job class, then yeah, I would unlock this class in a heartbeat... though I would most likely (depending on the job abilities and traits) swap it in as a fun new sub for WAR since I'm a little obsessed with the variety of that job
Truly awesome concept you've suggested with the team built "defensive potential" of such a weapon. I would imagine the strategy being insane around pulling off something as cool as this mid-battle, but the outcome would totally justify the means lol. Perhaps a minimum of 2 players dual-wielding these weapons (so 4 shields) could perform a simplified Testudo that protects a small to medium sized area around themselves. Furthermore, 3-4 dual-wielding players (that's 6-8 shields) could then increase both the potency of the party defense and the protection circumference around themselves. I'd love see this in real time action for sure.
Actually, apparently it's not just SquareEnix that hasn't explored this concept, cause I can't seem to find any information anywhere about a fighting style composed of dual-wielding melee shields. Unless I'm just looking in the wrong places or typing in the wrong names into google, I'm not sure if there has
ever been a fighting style composed of using two shields primarily as both weapon and defense (Yeah Rygar had
one badass Discarmor at his disposal, but that's where the line ends lol). I would be amazed to find out that such a fighting style ever existed.