Looking through everything, there's something I'm seeing mentioned quite a few times that's confusing me. Some examples would be:
This isn't nitpicking, it's just maintaining the standards of the wiki. Imagine how many buffs there would of have been if we just bought every villain with a "I'm going to destroy the ____" statement without the details in how.
Otherwise, Whitebeard would of have been 5-B for a similar "He'll destroy the world" statement.
It seems to imply there's something inherently wrong with this approach and seems to boil down to "but if we let this pass, we'd have to pass other instances of such a thing" without really explaining the problem. And what's more, it was confirmed with this being in line with wiki standards:
You'd be extremely surprised on how much we already allow this.
It almost seems like it can be countered with "well, sure, let's do that too", as there's no real elaboration as to the issue at hand here or why it's a problem. Maybe Whitebeard has evidence against this tier, but that just means it's very case-by-case, since of course not everyone is going to be a 1:1 of his case, fiction's just too flexible for that. The best I could find for why this would be troubling is "it's logical to take the statement as a hyperbolic one", but in this example (Bowser and the dream worlds), not only is it elaborated on to such an extent that hyperboles can be ruled out, but it's the driving force of the entire narrative that was mentioned to outright be causing damage to Dream Depot in both the English and Japanese localisations. Whilst if it was just Bowser saying it once, maybe I'd agree since it would more or less be a one-off quote, but not only does Bowser claim this a lot to the point it's basically drilled into your head, but Misstar shows great concern over it and even supports it with statements of her own claiming he could do so. Considering she's one of the Star Spirits who overlook Dream Depot, it pretty much seems like her job to know what can threaten the dream worlds, making her a reliable source. And considering how relieved she is at Bowser leaving a dream, it's pretty clear he's indeed a huge threat even in her eyes. So, to claim it's hyperbolic just doesn't work here.
Which means we're back to square one, what's the issue with taking claims of world destruction as... well... exactly that? I feel like I'm missing something, especially if the wiki has already accepted such cases and it's not like world destruction isn't a feat. Whilst "feats vs statements" is definitely something you hear a lot, we shouldn't outright deny statements. Whilst I can understand some cases may be contradicted, this doesn't mean all cases are contradicted (this one in particular being a core part of the narrative, so basically the whole game wants you to believe it) and so if the worry is just "it would open the flood gates", just apply a case-by-case basis as we do for a myriad of things already on this wiki (especially when the wiki has already opened said flood gates anyway!).
[Also this is solely questioning this particular issue, nothing about the "method being vague" points also being thrown around]