What's crazy is that Poe's "somehow" was thoroughly explained in all the expanded universe content that Disney threw in the garbage. They had an opportunity to adapt existing stories that were well-written and successful, and they said "fuck this shit" and tried to write their own story. But then the story they came up with was the same fucking story, only they didn't lay any of the groundwork to tell that story.
It would be more like, I dunno, some mega conglomerate trying to make a Second Age tv series without using the Silmarillion or the Unfinished Tales, so they were just like "Somehow, Númenor fell."