Theres a reason that when the movie Looper starts to mess with time paradoxes everything just fades to white and disappears. Theres so many different ways to address the impact of time-traveling but many of them are far too scientific and brain-meltingly confusing to belong on The Flash. Unfortunately, rather than try to come up with a sufficient explanation for how Eddies death changed things, the show just skipped ahead, barely addressing the colossal ramifications of Eobard Thawne never existing. Wouldnt Barrys mother have never been killed in this scenario? Wouldnt the particle accelerator have never exploded? These are the types of questions that The Flash should at least address, even if the answers arent satisfactory. Considering Barry himself has just traveled back in time again during the crossover episode with Arrow, things look to be jumbled up all over again. No one is expecting a realistic scientific explanation to whats going on, or an alternate reality where these changes are in effect, but its frustrating that The Flash is trying to include these huge concepts without properly explaining them.