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Also, shouldn't the timeline where Eobard Thawne was stopped from killing Nora have been nearly identical to the original timeline, where the particle accelerator exploded in 2020? Yet it seems like the Flashpoint timeline is very different from the original timeline: In the original timeline, Harrison Wells still owned STAR Labs, rather than Cisco, and Barry still ended up becoming the Flash, rather than Wally. So what exactly happened here?
Well...you can't go back in time and change your own history. You just end up creating a divergent reality. But you can't change the history of a divergent reality either. So, you have the 'original' timeline where nothing at all happens on that night, the divergent reality where Reverse-Flash kills Nora, and three or four other divergent timelines - each one created on the three or four times Barry's travelled back to that night. All of them may be different.
And remember, we don't know what happens in the original timeline. Perhaps Flashpoint is VERY close to it. Wally gets powers, Cisco is rich...The one point of divergence being that Barry never gets his speed.