For some aspects of the game's story and world that's certainly true, but not all of it. FF14 contains plenty of content that many would think falls under the umbrella of "political". The game contains lesbians and sex workers. Viera choose their gender when they come of age, fae entirely lack gender. The story presents opinions on capitalism, monarchy, wealth, class, disability, war, nationalism, colonization, religion, gender, and diversity.
So for example, is there a way to talk about how gender works for the Viera that is entirely detached from any ideas about how gender works in the real world? I honestly don't think there is. Any thoughts or feelings a person has about that are going to be shaped by what they've experienced in the real world. Even if I just say, "I really love how the Viera get to choose their gender when they come of age", a non-trivial amount of people will see that as "political" because gender as a concept is not isolated to FF14.
Because of that, I think a rule like the one you're suggesting would risk cutting off our ability to discuss aspects of the game world we enjoy spending time in, depending on how strictly it was enforced.
That said...
I went to double-check what the forum's rules are currently, and it turns out the rule you're requesting
already exists. I'm just going to drop the link to the rules here, because I think most people will be surprised by some of them:
https://forum.square-enix.com/ffxiv/...p?do=showrules
Personally, what surprises me is how much of the content I'm accustomed to seeing on these forums violates at least one rule. Like, did you know it's against the rules to "
criticize Square Enix staff or specific individuals"? And how often do you see that? And I consider the "
Use of inappropriate or aggressive language" to (unfortunately) be a one of this forum's most defining features.
My assumption is that the moderation team are trying to thread the needle such that discussion can be allowed within reason; I'm also willing to bet that they are understaffed for the job at hand.
So unfortunately, I think that demonstrates that this rule wouldn't solve things, since that rule has been in effect since 2011. If there's a solution, it will require additional enforcement of the current rules.