I think it depends on your understanding of Epcot. I would argue I:ROE was by far the most "EPCOT" of everything at the park in its history. That assumes the "theme" of Epcot is showcasing the history and possibility of human achievement and culture. You had a show that showed the collective history of our planet that then highlighted some of the most important achievements on this rock. The addition of water. The evolution of plants then animals. And finally the birth of mankind, starting with one of our most important discoveries - fire and recorded history. We then got into how we invented transportation types - on land, sea and sky. And then switch into celebrations of culture and art around the world. We then celebrate that (i.e. fireworks) and move to reflect on some of the greatest achievers on earth - ending with a profound yet simple view of our planet spinning round with its mountains and oceans on display. From there, we have the false ending, as we move to a message of hope of tomorrow. In short, it follows the general flow of many of the great EPCOT Center attractions like Horizons, WoM, SSE, etc. - of looking to the past, then present, then future. And it does it in the most masterful way I think I've ever seen personally. With a score that has never been rivaled for inspiration at any Disney Park.
This isn't me trying to patronize you or anyone with what you likely know. Rather, it's me writing that out is so incredibly inspiring and uniting. THAT's what Epcot has always stood for to me. Showcasing individual countries felt very exclusionary - as does Disney with specific films. I:ROE was inclusionary about our collective history and our collective future. The park showcases differences in that path. To end with one, unified message at night about how our collective stories come together as one. That's why I think I:ROE was the most "EPCOT" of any attraction at the park in its history.