I have to agree with the sentiment that the Arrowverse shows lack any real long-term consequences for major events. Save for a few permanent deaths (Laurel, Henry, Tommy, and Moira) you can be pretty sure that no major character is going to permanently die on any of these shows, like ever. Flashpoint had potential had it lasted more than a single f*cking episode and made more changes than just the gender of Diggle's child.
I think they should have waited a few episodes for Barry to come back on Flash because it doesn't leave much room for Wally and Cisco to be of much use now that Barry is the fastest speedster ever.
As for Arrow, there was basically no "Fallout" from the island explosion. Nobody gives a damn about Samantha dying, Diggle will be back to his old self in a matter of a few episodes, and the same goes for Thea.