I think the story was okay, the only point I had an issue with was the time travel since it was ultimately unnecessary. The echo can show visions of a potential future, or show events that occurred in the past related to a foci (be it a person or object). Given that they can't have the WoL just warp reality by changing the past, it would have made more sense that Venat and the WoL communicated indirectly via the echo, since the sundering is a fixed and unavoidable event, so anything that happens after the sundering would be beyond the scope of the unsundered to impact. While normally it would be impossible for the echo to go that far back, there are relics on the first that would enable it such as the old ruins, so communicating via that means would have made a lot more sense.