FFXIV does like to give its protagonists some humility, but this doesn't change the fact that they are shown by all accounts to be beyond all others in the setting, with those in leadership positions being much the same way (with, I believe, the exception of Nanamo particularly in the realm of physicality).
When you glance over The Great Man theory, you see the likes of historical juggernauts like Caesar or Genghis Khan. Obviously these men didn't single handedly conquer things. They had armies and many many mundane considerations to overcome, along with tons of idiosyncrasies in their personalities and vices and failings.
But the theory isn't positing that Great Men are perfect or without those things. It's positing that they have anomalies in their physiology that set them apart from their peers, allowing them to rise to those positions in the first place. And that most of these anomalies are with regards to individual intelligence and capability.
It then postulates that the Great Men still have to rely on society to be sympathetic to the way they think, you know, in order to want to follow them.
More or less, it's a very long winded way to say that Great Men are the, "idea guys" for society, and they create new paths for society to progress.
In our real world it's not just rulers who are the Great Men. It's inventors. It's philosophers. It's scientists. It's rulers. It's storytellers. And that's where the theory itself differs from the theory as a historical framing device.
But in FFXIV there is a lot of overlap with who the Great Men are. It's bundled up tightly with leadership. I'm basically saying that in XIV, we rarely come across common folk who are exceptional. It's always leadership. Mostly they're born into it. Their pedigree accounts for everything. Something something, it's a Rey Palpatine sort of situation. (with the exceptions/characters further from this being my favored characters, more often than not)
The WoL themselves fell to this, and I view it as a failing of the story. Our Ancient pedigree explains everything about our power, and we now use the Azem Stone without hesitation everywhere we go. Supposedly there's a Dynamis factor in it for us on top of that, but we've yet to consciously use Dynamis as the mainstay in a conflict explicitly. Yet, because of the way the story is now framed due to The Sundering being intentional, this also still ties our ability to be affected by/use Dynamis to our pedigree as a Sundered individual, so it's still inherited.
*ahem*
How that all ties into my "complaint" about us always dealing with leaders of nations and such, is that XIV is tacitly endorsing the theory because we have yet to see a commoner burgeon upwards and be stronger than a leader or even become a leader. The WoL used to be an example, but has not been for quite a while now, narratively (and won't ever be a leader of a place anyway). Like the closest thing we've got to that is like... The admiralty/pirate confederation of Limsa Lominsa, the Syndicate in Ul'dah, and Lyse (but of course, Lyse gave way to making a democratic republic and trying to put Raubahn in charge, which Raubahn actually still fits the bill as self made, from dirt, but he's also been sidelined heavily and is just a General now).
I don't know exactly how to articulate myself beyond this. Suffice it to say, where are the adventurers and fighters that rival the WoL? (this is what made things like Bozja so gripping for me) Where are the other Raubahns?
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Drawing back to the common man's role in Great Man Theory. Like I glossed over in the above, the Great Man Theory doesn't posit that the Great Men succeed alone. In fact, many of its proponents always argue that the Great Men still require the populace to want to follow them and their ideas.
The populace in FFXIV does want to follow us, as well as all of the leaders we've helped, and the leaders we've put back in power.
We do not yet have a storyline where we go to help people, and the people say to us, "No, you're wrong. We don't want to follow you at all. We won't even consider what you say. Your way is not what's best."
We had a tease of it with the Sharlayan Forum in Endwalker actually, but this is another of my disappointments with this story. The reticent of The Forum fell away under some of its own member's wanting to aid us. In the end, we got almost every culture from Eorzea to Hingashi to help us fuel the Aetherburner with the Forum's full blessing.
Anyway, this is all a bit long in the tooth now. I hope you understand me better in this post.