Let me start by saying I do actually agree with what you've been saying for the most part, but this is not the best justification as it's merely based on a technicality. That said, both attractions have some element of fantasy (and in this case, it's clear which relies on it more) and, I agree, that's no reason to say this attraction doesn't belong in EPCOT. Fantastical elements have always been a part of EPCOT attractions both new and old to help draw people in. They used real people and locations to tell fictional stories, even if those "stories" were just limited to a single gag or scene. The primary difference between Cosmic Rewind and the pavilions of yesteryear is a matter of where that emphasis on fantasy is placed. In the past, these fantasy elements were used to contribute to a much larger idea or concept that was strongly rooted in reality. Here with Guardians, it's the opposite. The primary focus of the attraction is the Eson storyline but the educational aspect is still there, it just serves as the backdrop. It's a different approach, sure, but it still works in my opinion. It's why I believe, despite how others may feel, this attraction (at least in its current form) is a better fit for EPCOT than it is for Magic Kingdom or Hollywood Studios. Too many people focus on the "why" aspect of it's placement instead of appreciating the fact that the inclusion of these supposedly forced, scientific elements do exactly what they're intended to, even if shoehorned in.