Okay so to be clear.....
A Roller coaster ride, in world of Discovery, that has a pre-show about meeting new cultures from outerspace that are close to us, and then have a great ride where you experience "space travel" to save the world isn't immersive enough for you? I get folks here that expect more of Disney, but sometimes I wonder if we don't keep moving the goal posts too much.
This is the new EPCOT, this is world of Discovery now, and they are discovering new worlds, races and peoples from space in a fun ride that highlights being part of a team that "saves the world" How is that not fun and immersive?
In a word - No. Because I would argue that's not at all what you are doing. I get that people want to make this new version work, but it just doesn't. At least not at the levels the old stories did. The ride is absolutely detailed. There is no doubt. But, there are too many things that don't work together for it to make sense.
The goal posts aren't moving at all. This has been my criticism since the very first uses of IP in the park more recently. The focus is more on the story of the IP and not the park itself.
While I appreciate your creativity, your story of World Discovery doesn't hold up under scrutiny beyond the surface. And, if it did, I would be all for it. The 4 attractions in World Discovery aren't about discovering new worlds. What in Test Track is about discovering new worlds?
Similarly, maybe it's about creating new worlds - as Play and Test Track are about using technology to create new worlds? Then Mission:Space and Guardians fail, since there is no creation on our part there.
Maybe it's about how technology, real and imagined, allows us to explore other worlds (what could have been one idea, especially if Play had been outer space themed instead of Instagram themed) - but Test Track still fails.
The problem is they are trying to blur fantasy and reality in one land. It would be like putting Mission Space next to Smuggler's Run because they are both about space travel. I know they tried to tie in Epcot with the pre-show. But, it's still fantasy. Test Track and Mission:Space are fantasy based in reality. Guardians is fantasy based in MCU scifi fantasy. It's the story of Tomorrowland, not Epcot.
There is no common thread between those 4 pavilions beyond some vague idea of futuristic look. The story just doesn't work if you dig into it at any level. (Much like Tomorrowland has become.)