Here is a different sort of example which will probably not appear onscreen, but who knows what the Discovery showrunners have in mind? Myriad Universe - Places of Exile depicts fluidic space as a multiversal singularity. The entire story hinges on no parallel timelines being possible for the Groundskeepers' home realm. IMO there is not a chance that screen canon will ever pick up that idea because, due respect to Christopher the author, it is too deep-cut physics for the average TV producer and average audience member to comprehend. Which is probably why Star Trek Online did nothing of the sort when depicting Species 8472.