What's the point with that quite lackluster story in Endwalker?

[KageTokage]

Speaking of wasted potential, remember the multiple times through the story where the echo was said to allow "transcending the barriers of the soul"? Like the ascian fusion at the end of Aetherochemical Research Facility and Zenos possessing Shinryu, not to mention all his body swapping. It was said that we hadn't yet gained full control of what the echo could do... And then there's the mess with the echo and the blessing of light in EW. I'm not completely sure how that game of calvinball ended but it looked like soul-transcending was completely dropped.

I'm really hoping the Echo isn't going to just be a convenient plot device going into the future and that we get more context behind it; particularly if we're going to be learning deeper truths about the aetherial sea and Etheriys.

The aftermath of the second coming of the Final Days would be a logical time to give it some focus again as the starshowers in Thavnair, Corvos, and presumably other lands overseas would presumably have awakened more people to the Echo.