I played a little at the start and then stopped caring but randomly listened to some lore info. I think towards the end it became clear that everyone is just a robot made by Shadow Lands titans, kind of how everyone was a robot on Azeroth except for the Trolls.
For me it's not that people can clear content it's that it makes previous content shit because the gear is so good in LFR. Back in Vanilla and TBC you could join the game or take a break and come back and you could pretty much progress through the expansion going from one raid to the next because it was a good way to gear. After that it became that each patch made everything in the expansion completely meaningless except for that patch, which means if you missed something you weren't going to see it outside of LFR.
Just kind of sucks coming in mid expansion and essentially having to afk in LFR until you get free gear and then just working on one raid instead of progressing through the different raids. In MoP I joined very late and outside of just afking in LFR I only really raided the three modes of Siege instead of having any reason to go back and raid things like Throne of Thunder at any difficulty above LFR as it didn't drop anything useful because of how gearing works. Some level of catch up gear or additional gear would be nice to help people progress instead of being perma-stuck on a raid tier, but what we have now is just a system where one raid and zone matters after you level up and everything else is just forgotten.
Well that's retarded.